Caponata is a traditional Italian vegetarian dish that originated in Sicily. It is a sweet and sour eggplant relish that is made by sautéing eggplant, onions, celery, and capers in olive oil, then simmering them in a mixture of vinegar, sugar, and tomato sauce. The result is a flavorful and versatile dish that can be served as an appetizer, a side dish, or even as a topping for bruschetta or crostini.