Imagine a towering chocolate creation built from a dozen cake tiers and a dozen glossy custard layers, finished with a silky semisweet ganache. This is not a pared-down dessert. It is a statement for celebrations, holidays and anyone who lives for intense chocolate. Read on for a clear, from-scratch method to make this showstopper at home.
Why this 24-layer chocolate cake stands out
This cake pairs deep chocolate sponge with a creamy chocolate filling. The result is extra-fudgy, intensely chocolate slices that look spectacular on a dessert table. It’s ideal for large gatherings, but you can halve the recipe for a smaller crowd.
- Layers: 12 cake tiers, 12 filling layers, plus ganache crown.
- Texture: moist crumb, dense and fudgy rather than light and airy.
- Occasions: weddings, birthdays, holidays and special dinners.
Ingredients: what you need for cake, filling and ganache
Below are grouped ingredient lists to keep the prep organized. Gather everything before you begin.
For the chocolate cake batter
- 1 3/4 cups unsalted butter, softened
- 4 1/2 cups granulated sugar
- 6 large eggs
- 1 1/2 cups unsweetened cocoa powder
- 4 cups all-purpose flour
- 1 1/2 teaspoons salt
- 3 teaspoons baking soda
- 1/2 teaspoon baking powder
- 1 cup + 2.5 tablespoons cold brewed coffee
- 1 cup + 2.5 tablespoons milk
- 4 teaspoons vanilla extract
For the chocolate custard filling
- 2 cups milk
- 2 cups + 2.5 tablespoons heavy cream
- 4 teaspoons vanilla extract
- 2 whole eggs
- 2 egg yolks
- 3/4 cup granulated sugar
- 6 tablespoons all-purpose flour
- 1/2 cup cornstarch (for slurry)
- 8 oz semisweet chocolate, finely chopped
For the semisweet ganache finish
- 5 oz semisweet chocolate, chopped
- 1/2 cup heavy cream
Step-by-step baking and preparation guide
Baking the cake layers
- Preheat oven to 325°F. Prepare two 9 x 3-inch round pans with nonstick spray and parchment circles.
- Sift cocoa, flour, baking soda, baking powder and salt together. Set aside.
- Combine cold coffee, milk and vanilla in a separate bowl.
- Cream butter and sugar at medium speed until light. Add eggs one at a time.
- On low speed, alternately beat in the dry mix and the milk-coffee mixture, starting and ending with dry.
- Divide batter between pans, smooth tops and bake for about 30–40 minutes.
- Use a toothpick to check doneness. Cool completely, then chill in the fridge so the cakes are firm.
- Trim domes for flat surfaces and carefully slice each cake into six even horizontal layers.
Making the chocolate filling (custard)
- Whisk flour and sugar in a bowl and set aside.
- Mix 1 cup cold milk with the cornstarch to make a slurry.
- Beat the eggs and egg yolks in a separate bowl.
- Bring heavy cream and the remaining milk to a simmer.
- Temper the eggs by whisking in half of the hot milk mixture slowly.
- Return the tempered eggs to the saucepan with the remaining milk mixture.
- Add the flour-sugar blend while stirring over low heat.
- Stir in the cornstarch slurry and keep stirring until thickened.
- Remove from heat, add chopped chocolate, let it sit a moment, then whisk until smooth.
- Beat the custard briefly with a mixer, then cool rapidly in an ice bath and chill until firm.
Preparing ganache and assembling the cake
- For ganache, pour boiling cream over chopped semisweet chocolate. Wait a few minutes, then stir until glossy.
- Place the bottom layer on a serving plate and surround it with a 9-inch cake ring or springform collar.
- Spread a thin layer of chilled chocolate custard on the cake. Repeat, alternating cake and filling, until all 12 layers are stacked.
- If you prefer, assemble two 12-layer cakes separately, freeze briefly, then stack them into one tall cake.
- Chill the assembled cake until the filling firms. Remove the ring and smooth custard on the outside if desired.
- Crumb the trimmed cake tops and press crumbs onto the custard for decoration.
- Pour ganache over the top and allow it to set before slicing.
Practical timing, yield and storage tips
- Prep time: about 2 hours, including chilling.
- Cook time: roughly 40 minutes in the oven.
- Total time: approximately 2 hours 40 minutes.
- Yield: serves about 24 slices, depending on portion size.
- Keep slices refrigerated. The custard keeps the cake rich and requires chilled storage.
Variations, serving ideas and flavor pairings
Want to change the profile? Try one of these directions.
- Triple Chocolate Mousse: swap the custard for layered mousses for an airy texture.
- Oreo Cheesecake Chocolate Cake: add an Oreo cheesecake layer in the middle for contrast.
- Chocolate Poke Cake: inject melted chocolate and sweetened condensed milk into a single-layer cake then top with whipped chocolate.
- Pair slices with espresso, salted caramel sauce or a scoop of vanilla ice cream for balance.
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