Cream shortening; gradually add sugar, beating well.
Combine flour, baking powder, and salt; set aside. Combine milk and water. Add flour mixture to creamed mixture alternately with milk mixture, beginning and ending with flour mixture. Mix well after each addition. Stir in vanilla.
Beat egg whites (at room temperature) until stiff peaks form; fold into batter.
Pour batter into 2 greased and floured 9-inch round cake pans. Bake at 350° for 25 minutes or until a wooden pick inserted in center comes out clean. Cool in pans 10 to 15 minutes; remove layers from pans, and let cool completely.
Split each layer horizontally, and spread Grape Filling between layers, reserving 1/2 cup Grape Filling. Spread Grape Frosting on top and sides of cake. Drizzle top of cake with reserved Grape Filling.
Oxmoor House Homestyle Recipes