A simple and relatively quick sauce. For a deluxe, long-simmered upgrade, see Hearty Beef Ragu.
Add to a large heavy saucepan or skillet:
If using pancetta or bacon, cook over medium heat, stirring, until it renders its fat, and drain off all but 2 tablespoons. Increase the heat to medium-high and add:
Cook, stirring, until the meat browns, about 7 minutes. Transfer the meat to a plate and pour off all but 2 tablespoons fat from the pan. Add and cook, stirring, until softened, about 5 minutes:
Add and cook, stirring, for 2 minutes:
Add the reserved meat and:
Cook, uncovered, crushing the tomatoes with a potato masher or a wooden spoon, until they have cooked down and smell very fragrant, about 15 minutes. Cover and cook over low heat, stirring often, until the sauce is thickened, about 30 minutes. Stir in: