Membrillo, is a sweet, firm, sliceable jelly made from cooked quince fruit, sugar, and sometimes lemon, popular in Spain and other countries as a dessert or appetizer. It's known for its tart-sweet flavor and is traditionally served with cheese, especially Manchego, but also works with cured meats or on toast. The name "cheese" comes from its solid, block-like form, similar to a cheese wheel, though it contains no dairy