Sisig is a Filipino dish made from parts of pig head and chicken liver, usually seasoned with calamansi, onions and chili peppers. Sisig was first mentioned in a Kapampangan dictionary in the 17th century meaning "to snack on something sour" and "salad". It usually refers to fruits, often unripe or half-ripe, sometimes dipped in salt and vinegar. It also refers to a method of preparing fish and meat, especially pork, which is marinated in a sour liquid such as lemon juice or vinegar, then seasoned with salt, pepper and other spices.