Cotechino is primarily made from pork, including the skin (rind), and is seasoned with a blend of spices.  The mixture is stuffed into a casing and then either cooked fresh or, more commonly, cured and aged.  Cotechino is usually simmered or braised for a significant amount of time, ensuring it's fully cooked and tender.  It's traditionally paired with lentils, often on New Year's Eve, but can also be served with mashed potatoes, polenta, or other side dishes.