Pineapple Dump Cake Pudding Use 1-1/2 sticks of unsalted butter (not margarine). Follow baking instructions. The baked pineapple dump cake will be bubbly with a golden crust. It will also be thin and slightly runny. After it cools, refrigerate 2 hours up to overnight to form a pudding. The cold pineapple mixture and the cold cake crust reminds me of vanilla wafers in banana pudding. Delicious!