Gluten-Free Rhubarb Custard Tart
This stunning Gluten-Free Rhubarb Custard Tart features a buttery almond flour crust, silky vanilla custard, and vibrant roasted rhubarb — a showstopping easy rhubarb dessert the whole table will love.
The Rhubarb Dessert You Didn't Know You Needed
Rhubarb has a way of dividing the room. Some people grew up pulling stalks straight from the garden and eating them dipped in sugar, while others have never quite known what to make with rhubarb beyond a passing curiosity at the farmers market. This Gluten-Free Rhubarb Custard Tart is here to convert everyone into a believer.
It brings together three of the most satisfying things in baking: a crisp, buttery almond flour crust, a silky vanilla custard filling, and jewel-bright roasted rhubarb layered on top. It looks like something from a patisserie window and tastes even better than it looks. Best of all, it is genuinely one of the easier rhubarb desserts you can pull off at home.
Why This Recipe Works So Well
Rhubarb recipes for dessert can sometimes veer into one-note territory all tartness, no balance. The trick here is roasting the rhubarb with a little sugar before it ever touches the tart. Roasting concentrates its flavor, softens its sharpness, and helps it hold its shape so you get those gorgeous pink pieces on top rather than a jammy mess.
The custard itself is a simple stovetop version enriched with egg yolks and cream. It is thick, lush, and fragrant with vanilla the perfect foil to rhubarb's natural acidity. Think of it as a rhubarb custard tart in the best possible sense: each bite has crunch, creaminess, and a bright pop of fruit all at once.
The almond flour crust is naturally gluten-free and far more forgiving than traditional pastry. It is pressed in rather than rolled, which means no chilling, no cracking, and no stress.
Chef's Tip: Do not skip blind-baking the crust. Even 20 minutes of pre-baking gives you that snappy, golden base that holds up beautifully under the custard without going soft.
A Note on Tools and Ingredients
For a tart this beautiful, a 9-inch removable-base tart pan is genuinely worth having in your kitchen. It makes unmolding effortless and gives you those clean, professional edges. Using a high-quality pure vanilla extract rather than imitation also makes a noticeable difference in the custard.
Fresh or Frozen Rhubarb?
If fresh rhubarb is in season near you, grab it. Look for firm, brightly colored stalks and use them the same day if possible. That said, this is one of the rhubarb easy recipes that works beautifully with frozen rhubarb too. Just thaw it fully and press it dry before roasting, or the extra moisture will thin out your custard.
For a rhubarb slice or bar-style variation, you can press this same filling into a square tin lined with the almond crust and cut it into rhubarb custard squares once set. It is a slightly more casual presentation but just as delicious.
Tip: If your rhubarb is very thin and young, reduce the roasting time by 3 to 4 minutes. You want the pieces tender but intact, not collapsing.
Ready to bake? Here is everything you need laid out step by step:
Gluten-Free Rhubarb Custard Tart
This stunning Gluten-Free Rhubarb Custard Tart features a buttery almond flour crust, silky vanilla custard, and vibrant roasted rhubarb — a showstopping easy rhubarb dessert the whole table will love.
Ingredients
- 1 1/2 cups almond flour, blanched, finely ground
- 3 tbsp tapioca starch
- 2 tbsp powdered sugar, sifted
- 4 tbsp unsalted butter, cold, cubed
- 1 large egg, cold
- 4 fresh rhubarb stalks, trimmed, sliced into 1-inch pieces
- 3/8 cup granulated sugar, divided
- 3/4 cup heavy cream
- 1/4 cup whole milk
- 3 large egg yolks, room temperature
- 1 tsp vanilla extract, pure
- 1 tbsp cornstarch, certified gluten-free
- 1/4 tsp salt, fine sea salt
Instruction
Preheat the oven to 375 degrees F (190 degrees C). Lightly grease a 9-inch tart pan with a removable base.
Make the crust: In a food processor, pulse together the almond flour, tapioca starch, powdered sugar, and salt until combined. Add the cold cubed butter and pulse until the mixture resembles coarse crumbs. Add the cold egg and pulse just until the dough comes together.
Press the dough evenly into the base and up the sides of the prepared tart pan. Use the back of a spoon to smooth it out. Prick the base all over with a fork.
Line the crust with parchment paper and fill with pie weights or dried beans. Blind bake for 12 minutes, then remove the weights and bake for another 8 minutes until lightly golden. Set aside to cool slightly.
While the crust bakes, toss the rhubarb pieces with 2 tablespoons of the granulated sugar in a bowl. Spread on a small baking sheet and roast for 12 to 15 minutes until just tender but still holding their shape. Remove and let cool.
Make the custard: In a medium saucepan over medium-low heat, warm the heavy cream and milk together until just steaming. Do not boil.
In a separate bowl, whisk together the egg yolks, remaining granulated sugar, cornstarch, and vanilla extract until pale and smooth.
Slowly pour the warm cream mixture into the egg yolk mixture, whisking constantly to temper the eggs. Pour the combined mixture back into the saucepan.
Cook over low heat, stirring constantly with a spatula, for 5 to 7 minutes until the custard thickens enough to coat the back of a spoon. Remove from heat immediately.
Pour the warm custard into the pre-baked tart shell and smooth the surface. Arrange the roasted rhubarb pieces decoratively on top.
Bake the filled tart at 325 degrees F (160 degrees C) for 15 to 18 minutes until the custard is just set with a slight wobble in the center.
Cool to room temperature, then refrigerate for at least 2 hours before slicing and serving.
Equipment
- 9-inch tart pan with removable base
- Food processor
- Pie weights or dried beans
- Parchment paper
- Small baking sheet
- Medium saucepan
- Mixing bowls
- Whisk
- Rubber spatula
Notes
Serving and Storing Your Tart
This tart is lovely served slightly chilled or at cool room temperature. A small spoonful of lightly whipped cream or a scoop of vanilla bean ice cream alongside takes it firmly into dinner-party territory.
Leftovers keep in the fridge for up to 3 days, though it rarely lasts that long. If you are looking for a rhubarb no bake dessert option, you can also try setting this custard without the final oven step by chilling it overnight once poured it will be softer and more pudding-like, but still wonderful.
However you serve it, this is the kind of rhubarb recipes dessert that earns recipe requests. Make it once and it will absolutely become a seasonal tradition.
