German Sweet Chocolate Cake - cooking recipe

Ingredients

1 (4 oz.) bar Baker's German's sweet chocolate
1/2 c. boiling water
2 c. sugar
4 egg yolks
2 1/2 c. sifted cake flour
1 tsp. baking soda
1 c. buttermilk
1 c. butter
1 tsp. vanilla
1/2 tsp. salt
4 egg whites, stiffly beaten

Preparation

Melt chocolate in water.
Cool.
Cream butter and sugar until fluffy.
Add egg yolks, one at a time, beating well after each. Blend in vanilla and chocolate.