Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust
A study in spring contrast. Tart rhubarb batons are baked directly into a rich hazelnut-brown butter frangipane, all held within a bitter, earth-forward cocoa-buckwheat crust. We finish with a sharp yuzu glaze to wake everything up.
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Ingredients
- 100 g All-purpose flour(For the crust)
- 50 g Buckwheat flour(Adds an earthy depth that bridges the cocoa and hazelnut)
- 20 g Dark cocoa powder(Dutch-processed, for bitterness and color)
- 50 g Powdered sugar(Dissolves cleanly into the crust)
- 4 g Fine sea salt(Divided (2g for crust, 2g for filling))
- 180 g Unsalted butter(Divided (100g cold for crust, 80g for browning in the filling))
- 2 Eggs(Divided (1 yolk for crust, 1 whole egg for filling))
- 100 g Hazelnut flour(Toasted almond flour works if hazelnut is unavailable)
- 100 g Granulated sugar(Divided (70g for filling, 30g for glaze))
- 300 g Fresh rhubarb stalks(Look for uniform width to make structural cuts easier)
- 30 g Yuzu juice(Lemon juice is an acceptable substitute)
- 1 pinch Flaky sea salt(For finishing)
- 1 egg yolk(egg yolk from one of the eggs)
Instructions
- 1
Prep your crust's dry foundation. In a bowl, whisk together 100g all-purpose flour, 50g buckwheat flour, 20g dark cocoa powder, 50g powdered sugar, and 2g fine sea salt until uniform in color. Label the bowl with tape if you're stepping away.
5 min
Tip: Why this works: Buckwheat and dark cocoa share an earthy, bitter profile. This crust isn't meant to be sweet; it's the structural guardrail for the fruit.
- 2
Cut in 100g cold unsalted butter using your fingers or a pastry blender until the mixture resembles damp sand. Add 1 egg yolk and gently knead just until the dough holds together.
5 min
Tip: Precision is freedom: Weigh your butter, keep it cold. No shaming if you use a food processor, just pulse carefully.
- 3
Press the dough evenly into the bottom and up the sides of a 9-inch tart pan with a removable bottom. Use the flat bottom of a measuring cup to level it. Place the pan in the freezer to set.
10 min
Tip: Pressing rather than rolling saves time and prevents tough gluten development.
- 4
Preheat your oven to 350°F (175°C). Set a timer.
0 - 5
Brown 80g unsalted butter in a small saucepan over medium heat until the milk solids turn dark amber and smell nutty. Immediately pour into a cool bowl to stop the cooking.
5 min
Tip: Wipe the counter while the butter browns, but don't take your eyes off the pan.
- 6
Whisk together 100g hazelnut flour, 70g granulated sugar, 1 whole egg, 2g fine sea salt, and the cooled brown butter until a thick paste forms. This is your frangipane filling.
5 min
Tip: The two-texture rule applies here: we want the rich, slightly grainy bite of the hazelnut to anchor the wet rhubarb.
- 7
Trim your 300g fresh rhubarb stalks into exact 2-inch batons. A ruler and a sharp knife make this deeply satisfying.
10 min
Tip: We're not adding steps—just improving decisions. Uniform cuts mean uniform baking.
- 8
Retrieve the frozen tart shell. Spread the hazelnut filling evenly across the bottom. Arrange the rhubarb batons on top in a tight, parallel, or chevron pattern, pressing them slightly into the filling.
5 min
Tip: Pack the rhubarb tightly; it will shrink slightly as it releases water during baking.
- 9
Bake the tart for 40 minutes, or until the frangipane is puffed and deeply golden, and the rhubarb is tender when pierced with a paring knife.
40 min
- 10
While the tart bakes, make the yuzu glaze. In a small pot, simmer 30g yuzu juice and 30g granulated sugar for 2-3 minutes until slightly syrupy. Set aside.
5 min
Tip: Yuzu provides a floral acid punch that cuts right through the brown butter.
- 11
Remove the tart from the oven. While it is still hot, brush the rhubarb heavily with the yuzu glaze. Sprinkle with 1 pinch flaky sea salt. Let it cool completely in the pan before removing the ring.
5 min
Tip: Let it cool. Future you deserves clean slices. The glaze will set into a brilliant lacquer.
Chef's Notes
Contrast is the secret ingredient. The success of this dessert hinges on the micro-adjustments: the 2g of salt in the crust to tame the cocoa, the bright flash of yuzu against the dense hazelnut, and the strict geometric structure of the rhubarb. It holds beautifully for up to two days at room temperature. Use a hot, sharp knife for service.
Frequently Asked Questions
How long does Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust take to make?
Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust takes about 1 hour 25 minutes total. That includes 45 minutes of prep and 40 minutes of cooking.
How many servings does this recipe make?
This recipe makes 8 servings.
What skill level is needed for Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust?
This recipe is rated medium — it's intermediate, requiring some cooking experience.
What ingredients do I need for Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust?
The main ingredients are: All-purpose flour, Buckwheat flour, Dark cocoa powder, Powdered sugar, Fine sea salt, Unsalted butter, Eggs, Hazelnut flour, Granulated sugar, Fresh rhubarb stalks, Yuzu juice, Flaky sea salt, egg yolk.
What type of meal is Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust?
Structured Rhubarb & Hazelnut Tart with Dark Cocoa Crust is categorized as: dessert.
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