1/4 c. butter
3 squares unsweetened chocolate
2 1/4 c. confectioners sugar, packed
1/4 tsp. salt
1/3 c. scalded milk
1 tsp. vanilla

Melt butter and chocolate over hot water double boiler and stir to blend. Measure sugar and salt into 2 quart mixing bowl. Add hot milk and stir until completely dissolved. Stir in chocolate. Beat while hot and thin with wooden spoon until spreading consistency, then beat in vanilla when mixture begins to chicken. Spread on cake when thick and creamy.