Step by step

Add the tomato passata and bring to a simmer; continue cooking for 3-4 hours on a very low flame

Tips
The best match for Bolognese sauce is undoubtedly homemade tagliatelle: alternatively, you could use spaghetti or some other long pasta.
Trivia
The origin of the Italian term for this meat sauce – ‘ragù’ – is, as you might guess, French: it comes from the word ‘ragoût’ which means ‘stew’.