Russian Napoleon Custard Layer Cake

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Russia's most beloved celebratory cake, the Napoleon is built from paper-thin pastry sheets layered with rich vanilla custard. After resting overnight, the crisp layers melt together into a tender, buttery slice crowned with golden crumbs.

Nutrition Facts

Per serving (estimated)

• 520 kcalCalories
• 30 gFat
• 17 gSaturated Fat
• 52 gCarbs
• 1 gFiber
• 22 gSugar
• 9 gProtein
• 210 mgSodium
• 190 mgPotassium
• 160 mgCalcium
• 2 mgIron
• 1 mgVitamin C
• 260 mcgVitamin A

Ingredients

For the pastry layers

• 3 1/2 cups (440 g) all-purpose flour, plus more for rolling
• 1 cup (225 g) cold unsalted butter, cubed
• 3/4 cup (180 ml) ice-cold water
• 1 tablespoon white vinegar
• 1 teaspoon fine salt
• 1 large egg

For the vanilla custard

• 4 cups (960 ml) whole milk
• 8 large egg yolks
• 3/4 cup (150 g) granulated sugar
• 1/3 cup (40 g) cornstarch
• 2 teaspoons pure vanilla extract
• 4 tablespoons (55 g) unsalted butter

For assembly

• 2 tablespoons powdered sugar, for dusting
• 1 teaspoon ground vanilla bean or vanilla sugar (optional)

Directions

1. Make the dough: Pulse flour and salt in a food processor, add cold butter and pulse until pea-sized. Whisk water, vinegar, and egg together, drizzle in, and pulse just until a shaggy dough forms. Turn out, press into a disc, wrap, and chill 30 minutes.
2. Make the custard: Warm milk in a saucepan until steaming. In a bowl, whisk yolks with sugar and cornstarch until pale. Slowly pour half the hot milk into the yolks while whisking, then return everything to the pan. Cook over medium heat, whisking constantly, until very thick, 4 to 6 minutes. Off heat, whisk in butter and vanilla, press plastic onto the surface, and chill until cool.
3. Prepare the layers: Divide dough into 8 equal pieces. Roll each piece on parchment into a 9-inch round as thin as possible (about 1/8 inch). Prick all over with a fork and slide onto a baking sheet.
4. Bake the layers: Bake one at a time in a 400°F (200°C) oven until golden and crisp, 4 to 5 minutes. Slide onto a flat surface to cool completely. Reserve any broken edges and trimmings; once cooled, crush them into coarse crumbs for the topping.
5. Assemble the cake: Place one pastry round on a serving plate and spread about 1/3 cup custard evenly over it. Repeat with 6 more layers, finishing with a pastry round on top. Spread remaining custard over the top and sides, then press the reserved crumbs all around the top edge and sides.
6. Soften the cake: Cover loosely and refrigerate at least 8 hours, ideally overnight, so the pastry absorbs the custard and becomes tender.
7. Serve: Just before slicing, dust the top with powdered sugar (and vanilla sugar if using). Cut into wedges with a sharp, thin knife, wiping the blade between cuts.

Cook’s Notes

• Roll each pastry round as thin as you can manage; thinner layers bake faster and give the cake its signature flaky texture.
• For the cleanest layers, trim the dough into neat rounds before baking so every sheet is the same size.
• A full overnight rest is non-negotiable: it transforms crisp sheets into the soft, melt-in-mouth texture Napoleon is loved for.
• Wipe your knife with a damp cloth between slices to keep the custard from dragging and smearing.
• If short on time, replace the homemade dough with 1.5 lbs (680 g) store-bought all-butter puff pastry, rolled thin and cut into 8 rounds.

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