Bolognese sauce is a classic Italian recipe for meat sauce. Generally, it contains 3 types of ground meat; beef, veal, and pork. Sometimes the cook will substitute other meats such as wild boar, deer, or other game meats. It is a very thick sauce and is not a tomato sauce but rather a meat sauce that has some tomatoes, or not. Bolognese sauce is typically served with a wide noodle like pappardelle, or fettuccini, or even used to fill lasagna.