Six-Layer Chocolate Fudge Cake with Fudge Icing

Preparation Instructions

Frosting

1. Combine butter, milk, powdered sugar, cocoa powder, salt, and instant coffee in a saucepan.
2. Melt the butter and cook the mixture for approximately 8 minutes, stirring continuously, until it thickens to a custard consistency.
3. Allow the frosting to set.

Cake

1. In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
2. Add the eggs, vegetable oil, buttermilk, and mayonnaise. Whisk until the batter is smooth.
3. In a separate bowl, mix the cocoa powder, black cocoa powder, coffee, and boiling water until smooth.
4. Combine the chocolate mixture with the cake batter and fold until just combined.
5. Divide the batter equally between three baking pans and bake.

Assembly

1. Once the cakes have cooled, trim the domes to ensure they are level.
2. Slice each layer in half horizontally to create a total of six thin layers.
3. Stack the layers, spreading a generous amount of the set frosting between each one.
4. Cover the entire exterior of the cake with the remaining frosting.
5. Optional: Add mini chocolate chips to the sides of the cake for decoration.