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In a bowl, combine the whipping cream, milk, and powdered sugar.
Add 1–2 tablespoons of instant coffee or a shot of cooled espresso and stir until dissolved.
Whip the mixture until soft peaks form. If you prefer a more stable filling, dissolve 1 tsp of gelatin in warm water and gently fold it into the whipped cream.
Assemble the Cake:
Slice your sponge cake into even layers if not pre-sliced.
Brush or lightly soak each layer with a bit of the coffee-milk mixture.
Spread the coffee cream evenly between each layer.
Finish with a thick layer of cream on top and smooth the edges.
Chill:
Refrigerate the cake for at least 4 hours, preferably overnight, to allow the flavors to meld and the cream to set.
Serving and Storage Tips
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