Ingredients
1/2 cup granulated sugar
1/4 cup water
3 squares unsweetened chocolate
4 egg yolks
1/4 lb. butter or margarine
1 cup sifted confectioners' sugar
1 tsp. vanilla
4 egg whites

Combine granulated sugar, water and chocolate in a saucepan. Cook over low heat, stirring until chocolate melts and mixture is smooth. Add egg yolks. Mix well and set aside to cool.

Combine butter, confectioners' sugar and vanilla then beat until fluffy. Add cooled chocolate mixture then beat well. Chill about 20 minutes.

Beat egg whites until stiff. Fold beaten whites carefully into chocolate frosting. Spread frosting thickly between layers of cake, smooth over top and sides. Chill in refrigerator overnight.