"A classic, irresistible homemade dessert featuring a fluffy walnut sponge, a rich and velvety vanilla custard buttercream, and a glossy dark chocolate glaze. Perfect for holidays and special family gatherings."
📊 Nutrition Facts (per serving)
- Calories: 430 kcal
- Protein: 6g
- Carbs: 36g
- Fat: 30g
- Fiber: 1g
🛒 Ingredients
For the Walnut Sponge
- 6 egg whites (at room temperature)
- 6 tbsp sugar
- 4 tbsp all-purpose flour (sifted)
- 1 level tsp baking soda
- 10 tbsp ground walnuts
- 1 pinch salt
For the Vanilla Buttercream
- 6 egg yolks (at room temperature)
- 150g - 200g sugar (to taste)
- 200g unsalted butter (minimum 80% fat, softened at room temperature)
- 1 tsp vanilla essence (or to taste)
For the Chocolate Glaze
- 100g dark chocolate (chopped)
- 2 tbsp vegetable oil (neutral flavor)
👨🍳 Instructions
Step 1: Prepare the Sponge Batter
Separate the egg whites from the yolks, ensuring no traces of yolk remain in the whites. Add a pinch of salt to the egg whites and whip until a steady, fluffy foam forms. Gradually add the sugar, one tablespoon at a time, whipping continuously until you achieve a glossy, stiff meringue. In a separate bowl, combine the flour, baking soda, and ground walnuts. Gently fold this dry mixture into the meringue using a spatula with slow, bottom-to-top motions to preserve the air and ensure a fluffy sponge.
Step 2: Bake the Sponge
Line a baking sheet with parchment paper and pour in the batter, leveling the surface gently. Bake in an oven preheated to 180°C (350°F) for 20 to 25 minutes. Do not open the oven door during the first 15 minutes of baking to prevent the sponge from collapsing. Once baked, remove from the oven and let it cool completely. Once fully cooled, carefully slice the sponge horizontally into two or three equal layers, depending on its thickness.
Step 3: Cook the Custard Base
In a heatproof bowl, whisk the egg yolks with the sugar until well combined. Place the bowl over a pot of gently simmering water (bain-marie), ensuring the bottom of the bowl does not touch the water. Stir constantly until the mixture thickens to a pudding-like consistency. Once thickened, remove from the heat and let it cool completely to room temperature.
Step 4: Finish the Buttercream
In a separate bowl, beat the softened butter until it is light, pale, and fluffy. Gradually add the cooled egg yolk custard, one spoonful at a time, beating continuously to incorporate. Finally, mix in the vanilla essence for flavor.
Step 5: Assemble the Cake
Place the first sponge layer onto a serving plate. Spread an even layer of the vanilla buttercream over it. Place the next sponge layer on top and repeat the process until all layers are assembled. You may reserve a small amount of cream to coat the sides of the cake for a cleaner, more finished look.
Step 6: Glaze and Chill
Melt the dark chocolate together with the oil in a double boiler or in the microwave in short bursts, stirring until completely smooth and glossy. Pour the warm glaze over the top of the cake and gently smooth it out. Transfer the cake to the refrigerator to set.
📝 Author Notes
This classic homemade walnut cake is a timeless dessert that perfectly balances textures and rich flavors. The combination of airy walnut sponge, velvety vanilla custard buttercream, and rich dark chocolate glaze makes it an elegant choice for holidays, family gatherings, or special occasions. It is highly customizable—you can swap walnuts for hazelnuts or almonds, add a splash of rum or liqueur to the cream, or use milk chocolate for a sweeter glaze.
🥡 Storage Tips
Store the cake in the refrigerator in a covered container for up to 3 to 4 days. Serve chilled or slightly brought to room temperature. The cake actually improves in flavor and texture the longer it sits, as the sponge absorbs moisture from the cream.