German Chocolate Cake
["4 oz. Baker's German's brand sweet chocolate", "1/2 c. boiling water", "2 c. sugar", "1 c. margarine", "4 egg yolks", "1 tsp. vanilla flavoring", "2 1/4 c. plain flour", "1 tsp. baking soda", "1/2 tsp. salt", "1 c. buttermilk", "4 egg whites, stiffly beaten"]
["Melt chocolate in boiling water.", "Cool.", "Cream butter and sugar until fluffy.", "Add yolks one at a time, beating well after each.", "Blend in vanilla flavoring and chocolate.", "Sift flour with soda and salt; add alternately with buttermilk to chocolate mixture, beating after each addition until smooth.", "Fold in beaten egg whites.", "Pour into 3 (9-inch) layer pans lined with wax paper. Bake at 350\u00b0 for 30 to 35 minutes.", "Cool.", "Frost tops only."]
["sweet chocolate", "boiling water", "sugar", "margarine", "egg yolks", "vanilla flavoring", "flour", "baking soda", "salt", "buttermilk", "egg whites"]