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