"1/2 cup of unsalted butter"
"1 cup of confectioner's sugar"
"4 egg yolks, separated"
"1/2 cup of coffee liqueur"
"1/2 cup of unsalted butter"
"1 cup of confectioner's sugar"
"4 egg yolks, separated"
"1/2 cup of coffee liqueur"
"Beat the butter with the confectioner's sugar and add the yolks one by one, beating well after each addition."
"Add the coffee liqueur."
"Beat the whites until fluffy and fold them into the yolk mixture carefully."
"Use this filling to top a cake or fill two layers of cake."