Chocolate Frosting

4 squares unsweetened chocolate
1 1/4 cups milk
4 tsp. flour
1 cup sugar
2 Tbsp. butter
1 tsp. vanilla

Add chocolate to milk in top of double boiler and het. When chocolate is melted, beat until blended. Sift flour with sugar, add a small amount of chocolate mixture, stirring until smooth. Return to double boiler, cook until thickened, and add batter and vanilla. Cool and spread on cake. Will cover tops and sides of two nine inch layers.