Gluten-Free Rhubarb Custard Tart
This gorgeous gluten-free rhubarb custard tart layers a buttery almond crust with silky vanilla custard and tangy roasted rhubarb for a stunning dessert that's surprisingly simple to make.
The Rhubarb Dessert You Didn't Know You Needed
If you have ever stood in front of a pile of rhubarb at the farmers market wondering what to make with rhubarb beyond the usual strawberry jam, this tart is your answer. It is elegant without being fussy, gluten-free without tasting like it, and genuinely one of the easiest rhubarb desserts you will ever pull off.
The combination of a golden almond flour crust, silky vanilla custard, and jammy roasted rhubarb hits every note you want in a spring or summer dessert. Think rhubarb custard squares, but elevated into a beautiful tart that slices cleanly and looks stunning on any table.
Why This Recipe Works So Well
The secret is in the two-step rhubarb prep. Instead of adding raw rhubarb directly to the tart, we roast it first with a touch of sugar. This does a few important things:
- It draws out excess moisture before it hits the custard, keeping the filling set and creamy.
- It concentrates that signature tart rhubarb flavor beautifully.
- It softens the stalks just enough that they become jammy and tender without dissolving entirely.
The almond flour crust is naturally gluten-free and brings a delicate nuttiness that pairs perfectly with the tangy rhubarb. It is genuinely better than a standard pastry crust for this recipe.
Chef's Tip: Do not skip the blind bake on the crust. That 12 to 14 minutes in the oven before adding any filling gives you a firm, crisp base that won't turn soggy under the custard.
The Right Tools Make a Real Difference
For rhubarb tarts, a 9-inch tart pan with a removable bottom is non-negotiable. It is what lets you unmold the tart cleanly and get those gorgeous slices without everything crumbling. A good food processor also makes the almond flour crust come together in under two minutes flat.
Picking and Prepping Your Rhubarb
For the best flavor, look for firm, bright red stalks with no soft spots. The redder the rhubarb, the more vibrant your tart will look. Green rhubarb works perfectly fine taste-wise, it just won't have that show-stopping rosy color in the finished slices.
A few quick prep tips:
- Always remove the leaves before cooking. Rhubarb leaves are toxic and should never be eaten.
- Slice stalks into uniform pieces, about half an inch thick, so they roast evenly.
- If your rhubarb is very thick, halve the pieces lengthwise first.
This is the kind of easy rhubarb recipe that genuinely rewards a little attention at the prep stage.
What the Custard Brings to the Table
The custard filling here is simple and intentionally understated. Heavy cream, whole milk, eggs, a splash of vanilla and just enough sugar. It sets to a just-barely-wobbling consistency that is rich without being heavy, letting the rhubarb stay firmly in the spotlight.
This is the texture that makes a rhubarb custard tart feel so different from a rhubarb crumble or a rhubarb slice. It is creamy, cool, and cuts through the tartness of the rhubarb in every bite.
Ready to make it? Here is the full step-by-step recipe:
Gluten-Free Rhubarb Custard Tart
This gorgeous gluten-free rhubarb custard tart layers a buttery almond crust with silky vanilla custard and tangy roasted rhubarb for a stunning dessert that's surprisingly simple to make.
Ingredients
- 1 1/2 cups almond flour, blanched, finely ground
- 3 tbsp tapioca starch
- 3 tbsp powdered sugar, for the crust
- 5 tbsp unsalted butter, cold, cut into small cubes
- 1 large egg, for the crust
- 4 rhubarb stalks, trimmed and sliced into 0.5-inch pieces (about 3 cups)
- 1/2 cup granulated sugar, divided, half for rhubarb and half for custard
- 3 large eggs, for the custard, room temperature
- 1 cup heavy cream
- 1/2 cup whole milk
- 1 tsp pure vanilla extract
- 1/4 tsp fine sea salt
Instruction
Preheat the oven to 375 degrees F (190 degrees C). Lightly grease a 9-inch tart pan with a removable bottom.
Make the crust: In a food processor, pulse together the almond flour, tapioca starch, powdered sugar, and salt until combined. Add the cold butter cubes and pulse until the mixture resembles coarse crumbs. Add the egg and pulse just until the dough comes together.
Press the dough evenly into the bottom and up the sides of the prepared tart pan. Use the back of a spoon or a flat-bottomed cup to smooth it out. Prick the base all over with a fork.
Blind bake the crust for 12 to 14 minutes until it is lightly golden and just set. Remove from the oven and let it cool for 10 minutes. Reduce the oven temperature to 325 degrees F (165 degrees C).
Prepare the rhubarb: Toss the sliced rhubarb with 0.25 cup of the granulated sugar and spread it in a single layer on a parchment-lined baking sheet. Roast at 325 degrees F for 15 minutes until just tender but still holding its shape. Set aside to cool slightly.
Make the custard: In a medium bowl, whisk together the 3 eggs and remaining 0.25 cup of sugar until smooth. Add the heavy cream, milk, vanilla extract, and salt and whisk until fully combined.
Arrange the roasted rhubarb pieces evenly over the pre-baked tart shell. Slowly pour the custard filling over the rhubarb, letting it settle between the pieces.
Bake at 325 degrees F for 28 to 32 minutes until the custard is just set with a very slight wobble in the center. It will firm up as it cools.
Transfer the tart to a wire rack and cool completely at room temperature, at least 1 hour, before removing from the pan and slicing.
Equipment
- 9-inch tart pan with removable bottom
- Food processor
- Rimmed baking sheet
- Parchment paper
- Medium mixing bowl
- Whisk
- Wire cooling rack
Notes
Serving and Storing Your Rhubarb Tart
This tart is at its very best served at room temperature or lightly chilled. A small dusting of powdered sugar or a few fresh mint leaves on top makes it feel genuinely special with almost no effort.
Leftovers keep well in the fridge for up to three days, making this a great make-ahead rhubarb dessert for dinner parties or weekend gatherings. Just pull it out 20 minutes before serving to take the chill off.
If you are exploring recipes with rhubarb for the first time, this tart is the perfect starting point. Once you taste how well that roasted, jammy rhubarb plays against a creamy custard, you will be reaching for those pink stalks every chance you get all season long.
