1.Heat oil in a large, heavy-based saucepan over moderate heat; cook onion, carrot, celery, bacon and garlic 5 minutes, stirring constantly, until onion softens.
2.Add mince; cook, stirring with a wooden spoon to break up lumps, 5 minutes, or until browned.
3.Stir in wine or stock, passata and bay leaf; bring to the boil. Reduce heat; simmer, uncovered, stirring occasionally, 45 minutes, or until sauce thickens slightly. Season with salt and pepper; remove bay leaf.
4.Place hot pasta in bowls; top with ragu and parmesan. Serve immediately.
No passata? Use 400g can diced tomatoes mixed with 1/3 cup tomato paste and 1/3 cup stock.