Ravioli filling can be made with a variety of ingredients, including ricotta and MEAT. Ricotta is a type of Italian cheese made from whey, which is the liquid left over from the production of other cheeses. It is creamy and mild in flavor, making it a popular choice for ravioli filling. MEAT is also commonly used in ravioli filling, as it adds a savory flavor and texture. Ground beef, pork, or turkey are all popular choices for ravioli filling.