Chocolate Frosting - cooking recipe

Ingredients

1/2 c. butter or margarine
1/8 tsp. salt
1 lb. (about 4 c.) sifted confectioners sugar
4 sq. Baker's unsweetened chocolate, melted
1 egg, unbeaten
1 tsp. vanilla
about 1/4 c. milk

Preparation

Cream butter.
Add salt and part of sugar.
Beat in chocolate, egg and vanilla.
Add rest of sugar alternately with milk, beating until smooth.
Frosts two layers.