Us Brits love our Spag Bol, but once you've tried this authentic Italian version, you'll wonder how they can both be called the same thing. And Italians would never serve this sauce with spaghetti - it has to be tagliatelle.
Salt and pepper to taste. You can use tomato puree instead of passata - just use half the quantity. And you can use pancetta or gianciale instead of bacon.