Rustida is a traditional pork dish originating from Piemonte. This stew requires long cooking in order to enhance the flavors of the less noble cuts of pork, and it's usually made with a combination of pork loin, pork hearts and lungs, crumbled sausage meat, butter, onions, tomatoes, stock, salt, and pepper.
There are a few variations on this simple recipe so it's not uncommon to add carrots, celery, red wine, and herbs such as sage, bay leaves, and thyme. The onions are sautéed in butter and mixed with the loin, heart, lungs, and sausage meat.