Cream together the butter and sugar in a bowl until light and fluffy. Sieve the cocoa and add it to the butter and sugar. Beat hard to incorporate. Lightly beat together the whole egg and the egg ...

You can also cook it in an oven. For the Chantilly: 1 cup of heavy whipping cream, 1 tablespoon of powdered sugar, beat it until it is at the nougat point. You can put it with a spatula or put it ...