Is it ensure, insure, or assure?
a sauce of ground beef, tomatoes, onions, celery, carrots, white wine, and seasonings, typically served with pasta; also written ragù sauce
A ragù is usually made by adding meat to a soffritto (a partially-fried mixture of chopped onions, celery, carrots, seasonings, etc.) and then simmering it for a long time with a bit of tomato sauce.
fr. Fr ragoûter 'to stimulate the appetite'