German Chocolate Cake
["1 pkg. German sweet chocolate", "1/2 c. boiling water", "1 c. butter or margarine", "2 c. sugar", "4 egg yolks (unbeaten)", "1 tsp. vanilla", "2 1/2 c. sifted cake flour", "1 tsp. baking soda", "1/2 tsp. salt", "1 c. buttermilk", "4 egg whites, stiffly beaten"]
["Melt", "chocolate", "in", "1/2", "cup", "of boiling water.", "Cool. Cream butter and sugar until light and fluffy.", "Add egg yolks, one at a time, beating after each.", "Add vanilla and chocolate; mix until blended.", "Sift flour with soda and salt.", "Add sifted dry ingredients", "alternately", "with", "buttermilk", "to", "chocolate mixture, beating", "after each addition until batter is smooth. Fold in stiffly", "beaten egg whites.", "Pour batter into 3 (8 or 9-inch) layer pans, bottom lined with wax paper.", "Bake in 350\u00b0 oven", "for 30", "to", "40 minutes. Cool.", "Frost with Coconut-Pecan Frosting."]
["sweet chocolate", "boiling water", "butter", "sugar", "egg yolks", "vanilla", "cake flour", "baking soda", "salt", "buttermilk", "egg whites"]