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Reserve about 1.5 cups of frosting for frosting the outside of the cake, set aside.
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Put a dab of frosting onto a serving platter (don’t mind the one I am using on pictures, I transferred it to a serving carton later).
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Cut each cake layer horizontally into two equal layers with a long serrated knife.
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Place the bottom of the first layer onto the platter and press to adhere. Layer with 1/3 of the Egg Yolk Custard Buttercream, evening it out with an offset spatula. Repeat with the remaining layers and buttercream, finishing with the bottom side of the second cake layer up.
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Use the reserved frosting to cover the cake in a thin layer of buttercream, still leaving some (about 3/4 cup) for decorating.
Make Chocolate Ganache:
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Combine 1/4 cup hot cream with 1/4 cup chopped chocolate or chocolate chips and leave for 1-2 minutes. Stir until smooth.
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Pour on top of the cake and with the spatula spread it around until it drizzles down the sides of the cake.
Decorate:
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Fit a pastry bag or a ziplock bag with a snipped end with a star piping tip. Fill the bag with the reserved 3/4 cup buttercream. Pipe 5 large stars in on the side of the cake like shown on the picture, then in between the large ones pipe about 12 smaller stars, followed by 8 even smaller stars.
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Now dust some cocoa powder on top of the piped stars.
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If you have a couple chocolate covered coffee beans, put a couple of them inside the largest piped stars.
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This particular cake does not need any time to allow for mending of flavors, but it is good to leave it for about 1-2 hours in the fridge for all the layers to stick together and make it easier to cut.
Serving Suggestion:
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According to your preference you will either want to leave it out to come to room temperature before serving, or serve it cold from the fridge. I like it better cold.