This chocolate truffle cake blends a fudgy sponge, silky chocolate frosting, and homemade truffles into a dessert that steals the show. Read on for a clear, tested recipe and pro tips to build this impressive cake at home.
Origins and why this chocolate truffle cake deserves attention
This recipe comes from a celebrated Serbian food blog and has been lovingly adapted for English-speaking bakers. It pairs a light walnut sponge with a rich chocolate custard and handmade truffles. The result is layered texture and intense chocolate flavor that works for birthdays, dinner parties, or any special occasion.
What you’ll need — ingredients for cake, frosting, and truffles
Organizing ingredients by component makes prep faster. Measure everything before you start.
For the walnut sponge cake
- 8 large eggs, separated
- 8 tablespoons granulated sugar
- 16 tablespoons finely ground walnuts (about 1 cup)
- 2 tablespoons all-purpose flour
For the chocolate frosting (custard-style)
- 4 large eggs
- 8 tablespoons sugar
- 1 teaspoon vanilla extract
- 3.5 oz dark chocolate, chopped
- 3.5 oz toasted chopped walnuts
- 2 sticks unsalted butter, softened
For the truffles and coating
- 1/2 cup heavy cream
- 1 stick unsalted butter
- 9 oz dark chocolate, chopped
- 3.5 oz toasted hazelnuts, ground or chopped
- Grated orange zest (optional)
- 3.5 oz additional chocolate melted with 3 tbsp neutral oil for coating
Times, portions and equipment to prepare
- Prep time: about 1 hour 30 minutes
- Cook time: about 25 minutes
- Total time: around 1 hour 55 minutes plus chilling
- Yield: roughly 20 slices
- Recommended pan: large jelly roll pan lined with parchment
Step-by-step: baking the walnut sponge
- Preheat the oven to 390°F (about 200°C). Line a large jelly-roll pan with baking paper.
- Whip the egg whites until they form stiff peaks.
- Gradually add sugar to the whipped whites, one teaspoon at a time, and continue beating until glossy.
- Mix in the egg yolks one at a time, folding gently to keep the batter airy.
- Sift in the flour and fold in the ground walnuts until just combined.
- Spread the batter evenly in the prepared pan and bake 20–25 minutes, until set and lightly golden.
How to turn the baked sponge into layered cake
Allow the cake to cool slightly before cutting. For neat layers, trim the edges and divide the sheet into three equal rectangles. Before stacking, drizzle each layer with a light sugar syrup to add moisture.
Making the glossy chocolate frosting (custard-based)
- Whisk the eggs and sugar until smooth.
- Place the bowl over a double boiler and cook over medium heat, stirring, until the mixture thickens.
- Remove from heat and add chopped chocolate, stirring until fully melted.
- Let the chocolate custard cool to room temperature.
- Beat in softened butter until the frosting is smooth and spreadable.
- Reserve a small portion of frosting for an internal crumb coat. Fold toasted chopped walnuts into the remaining frosting for nutty texture.
Assembling and chilling the cake
- Place the first cake rectangle on a serving board. Spread a layer of walnut chocolate frosting.
- Repeat with the second and third layers. Use the reserved frosting to coat the sides and seams.
- Chill the assembled cake for several hours to set the filling and make slicing cleaner.
- Remove from fridge 30 minutes before serving to soften slightly and prevent the glaze from cracking.
Preparing the chocolate truffles — three flavor variations
These truffles are cooked ganache balls that firm up in the fridge. Divide the cooled ganache to create flavor contrasts.
- In a small saucepan over low heat, gently melt the butter with the heavy cream and bring briefly to a simmer. Remove from heat.
- Add the chopped chocolate and stir until smooth and fully incorporated.
- Divide the mixture into three portions:
- Mix one portion with ground toasted hazelnuts.
- Add grated orange zest to the second portion.
- Flavor the third portion with 1 tablespoon coffee liqueur or 1 teaspoon instant cappuccino powder.
- Chill the mixtures until firm, then roll into small balls to make about 40 truffles.
- Roll some truffles in chopped toasted hazelnuts and others in cocoa powder. Drizzle or dip selected truffles in melted chocolate to coat.
Finishing touches: coating the cake and decorating
- Warm the melted chocolate mixed with oil for a smooth glaze.
- Pour the glaze over the chilled cake, allowing it to run down the sides.
- Sprinkle the rim with chopped toasted hazelnuts for crunch and contrast.
- Arrange the handmade truffles on top as a dramatic garnish.
Smart tips for best results
- Room temperature eggs whip more easily and give better volume.
- Toast nuts until fragrant to intensify flavor.
- Chill the cake long enough so layers set before glazing.
- Take the cake out of the fridge 30 minutes before slicing to avoid glaze cracking.
- Use a serrated knife heated under hot water for cleaner slices.
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