Put chopped onions in a pan together with garlic and olive oil, cook until slightly brown

Simmer with white wine until evaporated

Add rosemary and black pepper

Add passata and season to your taste, cook for 10 minutes on low heat

Put tagliatelle in salted boiling water and cook for 3 minutes

Drain tagliatelle and add them to the sauce pan, cook for 1 minute

Serve sprinkling some grated parmesan over it