German'S Sweet Chocolate Cake
["1 (4 oz.) pkg. Baker's German's sweet chocolate", "1/2 c. boiling water", "2 1/4 c. sifted cake flour (or regular flour)", "1 tsp. baking soda", "1/2 tsp. salt (optional)", "1 c. butter or margarine (I use butter)", "2 c. sugar", "4 egg yolks", "1 tsp. vanilla", "1 c. buttermilk", "4 egg whites, stiffly beaten"]
["Melt chocolate in boiling water; cool.", "Sift flour, soda and salt.", "Cream butter and sugar well.", "Add egg yolks one at a time, beating after each.", "Blend in vanilla and melted chocolate.", "Add flour mixture alternately with buttermilk, beating after each addition.", "Fold in beaten egg whites.", "Pour into 3 (9-inch) greased and floured layer pans.", "Bake at 350\u00b0 for 30 to 35 minutes.", "Cool in pans 15 minutes.", "Remove and cool on rack."]
["chocolate", "boiling water", "cake flour", "baking soda", "salt", "butter", "sugar", "egg yolks", "vanilla", "buttermilk", "egg whites"]