Combine pudding mix, cake mix and vegetable oil. Add eggs, one at a time, beating well after each addition. Blend 7-Up® into batter. Pour into three 9-inch cake pans that have been greased and floured. Bake at 350° F for 20 minutes. Remove from oven; let stand for 10 minutes. Remove layers from pans and cool on racks. Place Filling between layers and on top of cake.
Variation: Use lemon cake mix and instant pineapple pudding mix.
Mix sugar and flour. Add slightly beaten eggs and butter or margarine. Place in top of double boiler and cook until consistency of syrup. Add remaining three ingredients.
Servings: 8