German Chocolate Cake
["1 (4 oz.) bar German sweet chocolate", "1/2 c. boiling water", "3/4 c. oil", "2 c. sugar", "4 egg yolks (unbeaten)", "1 tsp. vanilla", "2 1/2 c. sifted flour", "1/2 tsp. salt", "1 tsp. baking soda", "1 c. buttermilk", "4 egg whites, stiffly beaten"]
["Melt chocolate in boiling water; cool.", "Cream oil and sugar until fluffy.", "Add egg yolks; beat well.", "Add melted chocolate and vanilla.", "Sift together flour, salt and soda.", "Add buttermilk to chocolate mixture.", "Beat well until smooth.", "Fold in egg whites. Pour in 3 greased and floured pans.", "Bake at 350\u00b0 for 30 minutes. Cool and frost."]
["sweet chocolate", "boiling water", "oil", "sugar", "egg yolks", "vanilla", "flour", "salt", "baking soda", "buttermilk", "egg whites"]