Step 1

Preheat oven to 350 degrees F. Drain pineapple, reserving juice; set pineapple aside.

Step 2

Combine pineapple juice, cake mix, eggs, mandarin oranges, and mayonnaise in a large mixing bowl. Beat at medium speed with an electric beater until blended. Pour batter into a greased 9- x 13-inch baking dish. Bake 30 minutes or until a wooden toothpick inserted in center comes out clean. Cool in dish on a wire rack.

Step 3

Combine drained pineapple, whipped topping, and pudding mix in a mixing bowl; beat at low speed until blended. Spread mixture evenly over cake. Cover and chill at least 1 hour before serving. Store in refrigerator.