Apples, pears and quinces never fail to catch me off guard when they come tumbling into season each August, interrupting my summer fruit frenzy. Stone fruit, figs, and berries can't hang around in cold storage all winter long the way pomes can, so I try to have as much fun with them as possible during their short season. But it means I often miss out on the more delicate of the fall fruit. This can't be a quincidence. (Sorry – couldn't help myself..)
Luckily my friend Amelia was using her noggin last month, when the first quinces were ripe. She peeled, cored, and sliced the little buggers and roasted them with vanilla, cardamom, wine, and honey after a recipe I adapted (and posted here) from Deborah Madison's Seasonal Fruit Desserts a couple of years ago.
In order to be edible, quince need to have the crap cooked out of them but when they do, they turn pink and taste like magic and fairytales perfumed with roses and tropical fruit. We ate a bunch slathered on crackers with Cowgirl Creamery's Mount Tam cheese, and she kindly left me to my own devices with the rest of the jar.
In San Francisco, we don't have trees that turn color, or frost that coats the ground. The way I know that Fall is here is that I no longer crave nectarines or zucchini, even though they look as colorful and shiny as ever. Instead I start dreaming of baked apples, crispy potatoes, and butternut squash soup.
Luckily, the quince keep well in their syrup for a month or two. My stomach finally got the Fall memo last week, and I whipped up this tart of pureed roasted quince and sliced apples in a flaky buckwheat crust. It's a quincessential fall dessert. (Ouch. Sorry..)
I drained the quinces, reserving their syrup, and pureed the fruit to a thick paste with a touch of lemon and honey. I spread this into an unbaked tart shell, a twist on my gluten-free pie dough made with buckwheat flour, whose nutty-spicy taste I especially love with fall fruit.
Over the quince puree went a few apples, peeled, cut off the core, and sliced fairly thin. I found a new to me variety called Belle de Boskoop at Everett Family Farm (my favorite place in the world) which hail from the Netherlands but are billed as a French culinary apple. These are crisp and tart-sweet, with a floral perfume and firm flesh that makes them ideal for baking.
Not wanting to let the rosy quince cooking liquid go to waste, I reduced it down to a thick syrup that, due to quince's high pectin content, turns a jelly-like consistency when cool. I used this to glaze the baked tart. Baked apples can look anemic and dry, so tarts like these need a glaze to give them some shine and color.
Normally I would have parbaked a tart crust like this, but since the filling is relatively dry and the apples like a long bake, it isn't necessary here. The sturdy crust stands up well to the filling, staying crisp for days afterward.
The finished tart has a sophisticated, barely-sweet flavor thanks to the cardamom-kissed quince, tart apples and whole grain flour. The charcoal-hued crust bakes up crisp with the rich flavor of buckwheat that I find completely addictive. These bold tastes are tempered by tender apples, which caramelize a bit around the tips. A dollop of sweetened whipped cream helps to further smooth away any rough edges, though vanilla ice cream would be nice with warm tart, too.
Happy Fall.
More Fruit Recipes:
- Apple Quince Pie (GF option)
- Gluten Free Apple Crisp {vegan option}
- Apple Chicory Salad with Fennel, Walnuts, and Grana
- Roasted Quince and Apple Turnovers
- Super-Moist Pink Pearl Apple Cake
- Almond Crostata With Ricotta & Jam {gluten-free}
- Apricot Crème Fraîche Tart with Honey and Pistachios
*Bojon appétit! For more Bojon Gourmet in your life, follow along on Instagram, Facebook, or Pinterest, purchase my gluten-free cookbook Alternative Baker, or subscribe to receive new posts via email. And if you make this apple quince tart recipe, I’d love to know. Leave a comment and rating below, and tag your Instagram snaps @The_Bojon_Gourmet and #bojongourmet.*

Apple Quince Tart with a Gluten-Free Buckwheat Crust
Print Recipe Pin RecipeIngredients
For the Roasted Quince:
- 3 cups water
- 1 1/4 cups organic sugar
- 1/4 cup honey
- 1 vanilla bean, split lengthwise and scraped
- 6 cardamom pods, cracked
- 6 large quince (about 4 cups peeled and sliced)
- 1/4 cup late-harvest Riesling, Muscat, or other white dessert wine
For the Gluten-Free Buckwheat Pie Dough:
- about 6 tablespoons ice water
- 1/2 cup sweet rice flour (2 3/4 ounces)
- 1/2 cup buckwheat flour (2 1/4 ounces)
- 1/4 cup cornstarch (1 ounce)
- 1 teaspoon sugar
- 1/2 teaspoon xanthan gum
- 1/4 teaspoon fine sea salt
- 6 tablespoons cold, unsalted butter, sliced thinly (3 ounces)
For the tart:
- 1 1/4 cups roasted quince (from above), drained, syrup reserved
- 1 tablespoon (meyer)lemon juice
- 1 tablespoon honey
- 3/4 cup syrup from the quince, more as needed
- 3 large baking apples (such as Belle De Boskoop, Granny Smith, or Pink Lady)
- 2 tablespoons melted butter
- 1-2 tablespoons sugar
- lightly sweetened whipped cream or vanilla ice cream, for serving
Instructions
Roast the quinces:
- Position a rack in the center of the oven and preheat to 375ºF.
- In a large saucepan, combine the water, sugar, honey, vanilla pod and scrapings, and cardamom. Bring the mixture to a boil, stirring occasionally, then simmer over low heat while you prepare the quince.
- Peel the quince (I like to use a T-shaped vegetable peeler), and cut them off the core (or halve and core for cleaner slices). Cut the quince into 3/4" thick slices. Lay the quince slices in a gratin dish or other shallow baking dish with a 2-quart capacity.
- Pour the boiling syrup and spices over the quince.
- Bake the quince, uncovered, for about 2 hours, turning the slices over in their juices every 30 minutes (and more frequently during the end of the cooking time). When done, the quince should be tender and rosy, and somewhat translucent.
- Remove the quince from the oven and pour the wine over them. Cool the quince in the their juices, pack into a quart-sized mason jar, cover with the liquid, and refrigerate for up to 2 months (or store in the freezer for longer).
Make the gluten-free buckwheat dough:
- Make your ice water by filling a small cup with ice and topping it with cool water. Set aside while you get on with the recipe.
- In a large bowl, combine the flours, cornstarch, sugar, xanthan gum, and salt, and stir to combine. Scatter the butter slices over the top, and work with a pastry blender until the butter is in almond-sized chunks. Tablespoon by tablespoon, dribble in the ice water, tossing with a rubber spatula and/or your hands after each spoonful, until the dough is just damp enough to hold together when you give it a squeeze. Add drops of water directly to the floury bits if needed; you may need more water, or less, depending on how warm and worked-in your butter is. When finished, the dough should look like a pile of fat crumbles. We'll bring it together in the next step.
- Dump the dough out onto the counter, and quickly fraisage it by scraping an eighth of the dough at a time across the counter beneath your palm. Scrape it up with a metal bench scraper, and gather it into a ball. Place on a piece of plastic wrap, flatten into a 6" diameter disc, wrap, and chill for at least 30 minutes or up to 2 days.
- When you're ready to use the dough, let it soften at room temperature for 5-10 minutes. The dough is a touch more delicate than regular pie dough, so it benefits from slightly softer butter. Gently roll it out into an 11-12" round on a surface dusted lightly with buckwheat flour. Dust the pin, your hands, the dough, and the work surface with just enough flour to keep the dough from sticking. If the dough tears, pinch it back together, or use a scrap of dough to patch it up.Gently lift the dough into a 9 or 10" tart pan with a removable bottom; the dough may crack and tear, and that's ok, just press it into place with your fingers. Trim the edges to 1" and fold them over to make a double-thick crust, trimming the top of the crust flush with the pan. Freeze the crust until firm, 15-20 minutes (or wrap and freeze for up to a month).
Assemble the tart:
- Position a rack in the lower third of the oven and preheat to 425ºF.
- In the bowl of a food processor, combine 1 1/4 cups of the roasted, cooled quinces with the lemon juice and honey. Puree to a smooth paste, adding a tablespoon of quince syrup if needed to help the mixture turn over. Spread the paste evenly in the bottom of the frozen, unbaked tart shell and set aside.
- Place 3/4 cup of the quince syrup in a small saucepan. Simmer over medium heat, swirling occasionally, until reduced to 1/4 cup, about 10 minutes. Set aside.
- Peel the apples, cut them off the core, and slice them about 1/8" thick, keeping the slices together for easy fanning. (If the apples start to oxidize or turn brown, drop them into a bowl of cool water and the juice of 1 lemon as you work – some apples oxidize more than others.) Fan the apple slices out the long way with your fingers and place them in concentric circles in the pan with the round edges facing out. It works well to use the fatter slices in the outermost rings. You may or may not need all the apple slices, but you can pack them in pretty tightly; they'll lose a lot of volume as they bake.
- Brush the apples with the melted butter and sprinkle with 1-2 tablespoons of sugar (depending on the tartness of the apples).
- Bake the tart at 425º for 20 minutes. Remove the tart from the oven and brush with a layer of the quince glaze, reserving the rest. Reduce the heat to 375º and bake until the apples are tender when pierced with a knife and golden around the edges, about 40 minutes longer.
- Let the tart cool slightly, then brush the apples and the top of the crust with the remaining quince glaze (re-warm until fluid, adding a few drops of water if necessary to loosen it up). Remove the sides of the pan by placing the tart on a large can or ramekin and easing off the sides. Slide the tart onto a cutting board and use a large, sharp chef's knife to cut it into wedges.
- Serve the tart warm or at room temperature with lightly sweetened whipped cream or ice cream. Leftovers keep well, refrigerated and airtight, for up to 4 days.
Notes
Nutrition
Apple Quince Tart with a Gluten-Free Buckwheat Crust
This recipe has a few different steps: roasting the quince, pureeing them to a paste and reducing their syrup, making the dough, and assembling the tart. However, the quince can be made up to a month ahead and stored in the refrigerator in their syrup; the pie dough can be made one or two days ahead; and the finished tart keeps well for at least a day or two.
This will make enough quince for 3 tarts; they are also delicious eaten on their own with cheese and crackers, or chopped and baked into muffins or pancakes.
As for the crust, be sure to use sweet white rice flour (such as Mochiko brand), which is naturally stickier than regular rice flour. I like using the fraisage method (in which portions of crumbly dough are scraped across the counter under your palm) to bring the dough together, but if that freaks you out, you can just give the dough a quick knead in the bowl until it sticks together in a ball. This dough is a bit more delicate to roll out than a wheat-based pie dough, so be gentle with it, use plenty of flour, and keep a metal bench scraper or spatula nearby to help you turn and flip the dough as you roll it out. I like to get it started by using a pressing motion with the rolling pin. If it cracks or tears, smush it back together with your hands, or use dough scraps to repair tears in the final dough. See my original post on gluten-free pie dough for photos of the fraisage process.All ounce measurements here are by weight.
Makes one 9-10" tart (about 8 servings)
For the Roasted Quince:
(Adapted from Seasonal Fruit Desserts)
3 cups water
1 1/4 cups organic sugar
1/4 cup honey
1 vanilla bean, split lengthwise and scraped
6 cardamom pods, cracked
6 large quince (about 4 cups peeled and sliced)
1/4 cup late-harvest Riesling, Muscat, or other white dessert wine
For the Gluten-Free Buckwheat Pie Dough:
about 6 tablespoons ice water
1/2 cup (2 3/4 ounces) sweet rice flour
1/2 cup (2 1/4 ounces) buckwheat flour
1/4 cup (1 ounce) cornstarch
1 teaspoon sugar
1/2 teaspoon xanthan gum
1/4 teaspoon fine sea salt
6 tablespoons (3 ounces) cold, unsalted butter, sliced thinlyFor the tart:
1 1/4 cups roasted quince (from above), drained, syrup reserved
1 tablespoon (meyer) lemon juice
1 tablespoon honey
3/4 cup syrup from the quince, more as needed
3 large baking apples (such as Belle De Boskoop, Granny Smith, or Pink Lady)
2 tablespoons melted butter
1-2 tablespoons sugar
lightly sweetened whipped cream or vanilla ice cream, for serving
Roast the quinces:
Position a rack in the center of the oven and preheat to 375ºF.
In a large saucepan, combine the water, sugar, honey, vanilla pod and scrapings, and cardamom. Bring the mixture to a boil, stirring occasionally, then simmer over low heat while you prepare the quince.
Peel the quince (I like to use a T-shaped vegetable peeler), and cut them off the core (or halve and core for cleaner slices). Cut the quince into 3/4" thick slices. Lay the quince slices in a gratin dish or other shallow baking dish with a 2-quart capacity.
Pour the boiling syrup and spices over the quince.
Bake the quince, uncovered, for about 2 hours, turning the slices over in their juices every 30 minutes (and more frequently during the end of the cooking time). When done, the quince should be tender and rosy, and somewhat translucent.
Remove the quince from the oven and pour the wine over them. Cool the quince in the their juices, pack into a quart-sized mason jar, cover with the liquid, and refrigerate for up to 2 months (or store in the freezer for longer).
Make the gluten-free buckwheat dough:
Make your ice water by filling a small cup with ice and topping it with cool water. Set aside while you get on with the recipe.
In a large bowl, combine the flours, cornstarch, sugar, xanthan gum, and salt, and stir to combine. Scatter the butter slices over the top, and work with a pastry blender until the butter is in almond-sized chunks. Tablespoon by tablespoon, dribble in the ice water, tossing with a rubber spatula and/or your hands after each spoonful, until the dough is just damp enough to hold together when you give it a squeeze. Add drops of water directly to the floury bits if needed; you may need more water, or less, depending on how warm and worked-in your butter is. When finished, the dough should look like a pile of fat crumbles. We'll bring it together in the next step.
Dump the dough out onto the counter, and quickly fraisage it by scraping an eighth of the dough at a time across the counter beneath your palm. Scrape it up with a metal bench scraper, and gather it into a ball. Place on a piece of plastic wrap, flatten into a 6" diameter disc, wrap, and chill for at least 30 minutes or up to 2 days.
When you're ready to use the dough, let it soften at room temperature for 5-10 minutes. The dough is a touch more delicate than regular pie dough, so it benefits from slightly softer butter. Gently roll it out into an 11-12" round on a surface dusted lightly with buckwheat flour. Dust the pin, your hands, the dough, and the work surface with just enough flour to keep the dough from sticking. If the dough tears, pinch it back together, or use a scrap of dough to patch it up.Gently lift the dough into a 9 or 10" tart pan with a removable bottom; the dough may crack and tear, and that's ok, just press it into place with your fingers. Trim the edges to 1" and fold them over to make a double-thick crust, trimming the top of the crust flush with the pan. Freeze the crust until firm, 15-20 minutes (or wrap and freeze for up to a month).
Assemble the tart:
Position a rack in the lower third of the oven and preheat to 425ºF.
In the bowl of a food processor, combine 1 1/4 cups of the roasted, cooled quinces with the lemon juice and honey. Puree to a smooth paste, adding a tablespoon of quince syrup if needed to help the mixture turn over. Spread the paste evenly in the bottom of the frozen, unbaked tart shell and set aside.
Place 3/4 cup of the quince syrup in a small saucepan. Simmer over medium heat, swirling occasionally, until reduced to 1/4 cup, about 10 minutes. Set aside.
Peel the apples, cut them off the core, and slice them about 1/8" thick, keeping the slices together for easy fanning. (If the apples start to oxidize or turn brown, drop them into a bowl of cool water and the juice of 1 lemon as you work – some apples oxidize more than others.) Fan the apple slices out the long way with your fingers and place them in concentric circles in the pan with the round edges facing out. It works well to use the fatter slices in the outermost rings. You may or may not need all the apple slices, but you can pack them in pretty tightly; they'll lose a lot of volume as they bake.
Brush the apples with the melted butter and sprinkle with 1-2 tablespoons of sugar (depending on the tartness of the apples).
Bake the tart at 425º for 20 minutes. Remove the tart from the oven and brush with a layer of the quince glaze, reserving the rest. Reduce the heat to 375º and bake until the apples are tender when pierced with a knife and golden around the edges, about 40 minutes longer.
Let the tart cool slightly, then brush the apples and the top of the crust with the remaining quince glaze (re-warm until fluid, adding a few drops of water if necessary to loosen it up). Remove the sides of the pan by placing the tart on a large can or ramekin and easing off the sides. Slide the tart onto a cutting board and use a large, sharp chef's knife to cut it into wedges.
Serve the tart warm or at room temperature with lightly sweetened whipped cream or ice cream. Leftovers keep well, refrigerated and airtight, for up to 4 days.
Joshua Hampton (Cooking Classes San Diego) says
What a pretty tart. I imagine this smells good straight out of the oven. Thanks for sharing this lovely recipe.
Alanna says
Thanks, Joshua! It certainly did. :)
Salvegging says
Stunning. Quincessential, I mean : ) Never tried quince...perhaps this will change that.
Alanna says
Haha, thanks! Quinces have such amazing flavor, I think it a real shame that they're not more widely used these days. If you want to taste quince without the fuss, though, you can sometimes find membrillo (Spanish-style quince paste designed to be eaten with manchego cheese) at fancy stores such as Whole Foods.
Asha Shivakumar says
This tart is perfection. Haven't had quince in a long time, you've inspired me.
Alanna says
Aw! Thank you, Asha. :)
Laura | Fork Knife Swoon says
Alanna, this is absolutely stunning. I love love love those glazed apple rings - beautiful!
Alanna says
Aw! Thanks, Laura!
Monet says
I've made quite a few apple tarts but none as beautiful and unique as this. I can't get over how lovely it looks and sounds. Thank you for sharing it with us Alanna!
Alanna says
Awwwww!! Thanks, Monet. You're too kind.
rcakewalk says
Gorgeous as always! Do you think I'd need to parbake the crust if I snagged it to use in pumpkin pie? If I can come by some quince, I'll have to give this a go as written :)
Alanna says
Oooh, I think this crust would be perfect with a pumpkin pie! I would probably parbake it in that case, since pumpkin custard has a higher liquid content. Though the recipe on the back of the Libby's can uses the same one I use here wherein you start the pie at a higher temperature to give the crust a head start, then turn it down. Now you've got me craving pumpkin pie. Please let me know how it goes. :)
Steph (desserts for breakfast) says
This look absolutely divine. I love the idea of quince paste under the apples.
Alanna says
Thanks, Steph!!!
Jessica @ Desserts with Benefits says
This is so incredibly beautiful, I am literally in awe of your photographs. I can't believe this is healthy and so nutritious. Great job!!
Alanna says
Aw! Thank you, Jessica! What a sweet thing to say. I'm loving your site full of healthy desserts...yum. :)
Irene says
Wow those golden tops are just gorgeous. I've never cooked with quince before but a quince tart sure does sound tasty! And I always have the utmost respect for those who can bake gluten free. Amazing!
Alanna says
Thanks, Irene! Baking gluten-free can be a total pain sometimes, but I feel like I'm finally getting the hang of it. I definitely recommend trying quince if you can get your hands on some (or at least membrillo - Spanish quince paste - which I'm seeing more in fancy food stores). Cheers. :)
Karen @ HonestlyYUM says
Wow so gorgeous!!!
Alanna says
Thanks, Karen! :D
Liz Cooper says
Just made this last Friday and was rewarded with a gorgeous delicious tart that held up in the fridge really well (until I finally polished it off last night.) Love cooking with quince, improbably ethereal smelling and that incredible flavor. The buckwheat crust was great with the flavors and I loved the crisp texture. I was hesitant as it was my first foray into a non wheat based crust but this was surprisingly easy! I used very tart(sour) granny smith apples with the 2 tbs of sugar. Nice balance of sweetness. Thank you so much for such a terrific tart! (I have been meaning to post for a while to let you know how much I enjoy reading and cooking from your beautifully written and photographed site. Many thanks for many great meals and drinks!)
Alanna says
Hi, Liz! Thank you for trying out the tart, and for the very kind comment - I'm so glad you liked it! I love working with quince, too - they're so very magical and other-worldly tasting. Thank you so much for reading, and for trying out my recipes - that means so much to me!
Kathy in Los Angeles says
I'm new to your blog, having just clicked through a post by David Lebovitz... I would love to leave out the xanthan gum in the crust. Can I get away with this?
Alanna says
Hi Kathy! I would say go for it. The dough is rather brittle, but if you're forming it in a pan (as shown here), I don't think the lack of xanthan gum will make a huge difference - you'll be pressing cracked dough into the pan anyway. That being said, I haven't actually tried this without it, so it could alter the texture of the finished product. Thanks for clicking through, and please let me know how it goes!
Kathy in Los Angeles says
Will do!
Kathy in Los Angeles says
Leaving out the xanthan gum worked just fine. I did add a teaspoon of ground flax seed, which may not have made any difference. And, I needed this one to be dairy free so used coconut oil and coconut butter (2/3 and 1/3). Normally I would use just the coconut oil but ran out. With the coconut solids from the butter, the crust baked a bit browner, so watch out. Then I simply pressed the cold dough into the tart pan with my hands rather than rolling it out. It wasn't a tender crust, but worked in a pinch. There is nothing like a flakey, buttery wheat crust.
Alanna says
Hi Kathy! Thanks for the report. I'm sorry the crust didn't turn out super tender, but I'm glad it worked in a pinch. The coconut oil and butter sound like they would impart a lovely flavor - yum! My version, shown here, wasn't the tenderest of crusts, either, though it was crunchy and delicious. My original, flaky gluten-free pie dough, however, IS super tender - you may wish to give that one a go. It's surprisingly similar to a wheat-based dough: https://bojongourmet.com/2013/09/flaky-all-butter-gluten-free-pie-dough.html
Elise says
Beautiful. I'm especially entranced by the buckwheat crust. I love buckwheat! I'll have to play around with it for a gluten-free crust. Thanks for the idea!
Alanna says
Thanks, Elise! I'm a bit of a buckwheat freak. :) Let me know how it goes!
Sofia says
This sounds intriguing! I can't believe you found Boskoop apples in the US. I grew up on them in Germany. They are the best apples for baking and for apple sauce. I had two trees in Maryland (from a nursery in Michigan (?)), but with the heat, humidity and squirrels I never got any apples :(
Alanna says
Yeah, Boskoops are amazing - my new favorite! I had never heard of them until a few weeks ago at that farm stand. I'm sorry to hear of the fate of your apples! :(
Sowmya Dinavahi says
This tart looks beautiful.. I've pinned it to try it :)
Alanna says
Aw, thanks, Sowmya!
meg says
Wow. This looks simply amazing. I've just discovered quince (I've never lived in an area where they were available until this year), and am totally in love. Thanks for this gorgeous and undoubtedly tasty dessert recipe!
Alanna says
Thank you, Meg! Quince are so very loveable - I'm glad you're getting to discover them!
Arielle says
Okay, I admit after seeing this gorgeous tart (and after having made your delicious lentil soup with chestnuts and fennel last week), I sought out some quince. They are sitting next to me on my desk, perfuming the air with the most lovely scent! Can't wait to make this.
Alanna says
That makes me so happy!!! Thank you for trying my recipes, Arielle, and for the sweet note. I hope you love the tart. :)
Donna says
Cannot WAIT to attempt this tartโฆ.I love buckwheat (sarrasin here in France)โฆI was wondering if I could replace the xanthan gum with psyllium husks..or ground chia or flax? It seems as if I have read somewhere that these can be substitutes?..Thoughts from you or your readers?
Alanna says
Aw, thanks, Donna! I haven't tried those binders in this recipe, but I've been seeing GF recipes that call for flax or chia, so it might be worth a try. Please let me know how it goes!
Sara says
Looks AMAZING. I made some membrillo that didn't set and this is its future!
Alanna says
Oh, perfect! Let me know how it turns out. :)
a-boleyn says
I missed this year's quince crop ... again. Luckily I had some quince jam so I could make a baked apple and quince tart. While not as pretty as yours (I cheated with a bought puff pastry crust) it was pretty tasty.
http://a-boleyn.livejournal.com/176684.html
Alanna says
Nice! Glad I could provide some quincespiration. ;)
My Year My Time says
I just came across this recipe and it looks divine! But is there an easier way to make the crust? I won't be able to get my hands on white rice flour or xhantan gum.
Alanna says
Thanks! Is gluten an issue for you? If not, you could use my regular pie dough recipe with buckwheat in place of the whole wheat/spelt flour. https://bojongourmet.com/2012/11/flakiest-all-butter-pie-dough.html Otherwise you could try a GF AP blend that is rice flour-based with xanthan gum in it. Let me know how it goes!
Olivia says
I would love to try this! I use brown rice flour for many recipes so I have a lot of that available. Do you think I could substitute the white rice flour for brown rice? Thank you!
Alanna Taylor-Tobin says
Hi Olivia! Is the brown rice flour that you have superfine or regular? I actually call for sweet rice flour here, which is more starchy and sticky than regular rice flour. I usually recommend subbing it by weight for a GF all-purpose flour or cassava flour, which are more similar in texture. If your flour is superfine it might work, otherwise I worry that it will be delicate and maybe slightly gritty.
I actually have a more recent favorite GF pie crust formula; you can use buckwheat flour in place of the millet and/or oat flours if you prefer to try this one! It's a little more sturdy and flaky, and less prone to shrinkage. I'll add this into the post for other readers as well!