Cake
1 small box vanilla instant pudding
1 (18.25 ounce) box white or yellow cake mix
3/4 cup vegetable oil
4 eggs
1 (10 ounce) 7-Up

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 degrees 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.

Filling
1 1/2 cups granulated sugar
2 tablespoons flour
2 eggs
1/2 cup butter or margarine
1 (8 ounce) can crushed pineapple, drained
1 (4 ounce) can coconut
1/2 cup nuts

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.