Cake layers may be made ahead and frozen, or cake may be made and assembled the day ahead.

Batter
1 (18 1/2 ounce) box yellow cake mix
1 (11 ounce) can Mandarin oranges, juice reserved
1/2 cup vegetable oil
4 eggs

Preheat oven to 350 degrees F. Grease and flour three 8- or 9-inch cake pans.

Beat eggs with cake mix; add reserved juice from oranges; stir in oil and fold in oranges using mixer to "break up" oranges. Bake 25 minutes. Cool and remove from pans. Wrap for freezing when cooled.

Icing
1 (12 ounce) carton Cool Whip
1 (20 ounce) can crushed pineapple with juice
1 large box instant vanilla pudding

Mix ingredients together and ice cooled cake with mixture. Refrigerate cake after icing.