This is an old-school refrigerator cake with a psychedelic marbled hue. I grew up eating this enthusiastically whenever my Nanny made it.
For the cake:
1 package lime jello (4 serving size)
1 package Duncan Hines lemon supreme cake mix
For the topping:
1 envelope whipped topping mix (2-2.5 c yield)
1 package lemon instant pudding mix
1.5 c cold milk
Dissolve the lime jello in 3/4 c boiling water. Add 1/2 c cold water, and set aside at room temp. Mix and bake cake as directed in a 9×13 pan. Cool cake 20 minutes but do not remove from pan. Using a fork, poke deep holes through the top of the still-warm cake. Slowly pour the lime gelatin mixture over the cake. Refrigerate the cake while preparing the topping.
In a cold, deep bowl, blend and whip together the topping mix, instant pudding and cold milk until stiff (3-8 minutes). Immediately frost the cake with it. Store the cake in the fridge and serve cold.
Although this might sound like a cake made of fake, it is truly delicious and you will not be able to stop eating it.