Traditional Spanish membrillo relies on quince to create a thick, sweet paste perfect for pairing with cheese. Here, leftover tomato skins, seeds, and pulp step in to perform a brilliant three-ingredient magic trick. The natural pectin in the tomato skins helps thicken the puree into a rich, sliceable preserve. It offers a sweet and savory flavor profile that works beautifully on a charcuterie board. Serve it alongside crusty bread and sharp cheeses for an elegant appetizer.