I usually use 1 cup of milk and get a bit heavy-handed with the cocoa. Vienna Cream (from the Women’s Weekly Children’s Birthday Cake Book): 125g butter | 1½ cups icing sugar | 2 tablespoons milk Have butter and milk at room temperature, place butter in small bowl of electric mixer and beat until butter is as white as possible. Gradually add about half the sifted icing sugar mixture, beating constantly, add milk gradually. Then gradually beat in the remaining icing sugar. Mixture should be smooth and easy to spread with a spatula.