Fudge Icing - cooking recipe

Ingredients

1/2 c. butter
1 egg
1/2 tsp. vanilla
2 c. confectioners sugar
1 1/2 sq. melted bitter chocolate

Preparation

Warm slightly the butter, but don't melt it.
Cream butter with confectioners sugar.
When thoroughly blended, beat in egg, melted bitter chocolate and vanilla.