You can warm it slowly in the microwave or place in the oven on warm until warmed through. Dehydrating removes the moisture from the pineapple and makes it a bit more like pineapple “chips” but with all the same nutritional value. How To Store Pineapple Upside Down Cake Bites . Simply place the other fruit and the upside-down pineapple inside the paper bag. Theoretically speaking, the sugar might still spread if you flip it upside down (the crown should be on the bottom). The first method involves standing the fruit upside down on their leaves. Yes, you can place the pineapple upside down cake in the refrigerator for up to 3 days. Place it upside down. Use a dehydrator to dry pineapple for storage. Though not always possible, sometimes when you buy an unripe pineapple, there may be a bit of starch left at the base of the fruit. How do you warm up pineapple upside down cake? I like to store these cake bites in the refrigerator. The starch is the "sugar factory" of any food, so if the pineapple has any remaining starch, it should be found in its base. Another method involves a paper bag and another fruit: apple, nectarine, or pear. #1. If you happen to have a dehydrator, you can prepare and store your pineapple nearly indefinitely! Best way to do Pineapple Upside Down Cake a day ahead? To use this starch for ripening, you can turn the fruit upside down and allow the sugar to spread to the rest of the fruit. Because of the fruit used I find it helps extend the shelf life of your cakes. To ripen an unripe pineapple sooner, always place it with its base upwards and balancing it on its leaves, that is, place it upside down. There are two methods that you can try to ripen a pineapple at home. Can you store pineapple upside down cake in the fridge? It seems like a way to make this a day ahead and keep it fresher, would be to use parchment in the bottom of the pan and leave it in the pan until just before departure, then flip it and peel off the parchment. They taste great cold but you can always warm them up by letting them sit out on the counter for 30 minutes or so. This helps in the upflow of the sugars which yields in ripening the fruit evenly, and saves the fruit from rotting. I plan to take a pineapple upside down cake to dinner at a friends tomorrow. Cover with saran wrap or place leftovers in an airtight container .