Ingredients 2 or 3 zucchini Leftover mashed potatoes Canned Tuna fish 1 egg Grated stale bread 1 tablespoon of Parmesan Cheese Seasoning Salt and pepper Preparation Slice and grill the zucchini. In a bowl, mix the leftover mashed potatoes with the egg, the Parmesan Cheese and Tuna fish. Add grated bread enough to stiffen the mixture. Adjust with salt, pepper and your favourite seasoning (thyme, marjorane, parsley). Now, form the rolls: spread on each .