I recommend these be made just before eating. If the batter sits too long, it becomes very watery due to the zucchini continuing to release moisture. Watery batter = soggy patties. If there are leftover fritters, they can be reheated by gently frying again in a skillet. Do not microwave – you will end up with soggy patties. Again. But really, freshly made is the best. Fresh batter made into fresh fritters. It’s a texture thing.