An OLLA is a type of earthenware cooking jar, typically used in Spanish and Latin American cuisine. It is an unglazed clay pot with a wide mouth and narrow base, which is used to cook soups, stews, and other dishes. The OLLA is traditionally placed over an open fire or on a stovetop, and the lid is often left off during cooking to allow steam to escape. The earthenware material helps to retain heat and moisture, making it an ideal vessel for slow-cooking.