1-2 tbsp. milk
1 tbsp. (2 oz.) cocoa powder
6 tbsp. (3 oz.) soft butter
3/4 c. (6 oz.) confectioners' sugar

Put the butter in the bowl and cut into small pieces. Beat hard with wooden spoon and stir until soft and creamy. Sift the sugar and cocoa powder into the bowl a little at a time, mixing well with butter. Then stir in the milk.