Step 1

In a 9- x 13-inch baking dish, arrange cake slices.

Step 2

In a medium bowl, dissolve gelatin in boiling water and stir in cold water. Slowly pour over cake, then refrigerate 1 hour.

Step 3

In a large bowl, whisk vanilla pudding mix and milk until thickened. Stir in orange zest and whipped topping. Evenly spread over cake.

Step 4

Cover and refrigerate 1 hour, or until ready to serve. Garnish with orange slices.