Mix pudding mix into the can of crushed pineapple (Do not drain pineapple). Let set 5 mins. fold in cool whip and let chill for 1 hour.
I got this recipe out of a magazine. It only called for 1 cup of cool whip, but I put more–I think it would have been too strong with only 1 cup. The recipe called for a sponge cake with fresh berries on top, but this filling would work with any kind of cake.