Clean and wash the carrots and celery and cut them into small cubes. Finely dice the onion. Dice bacon and leave it crisp in hot oil. Add vegetables and onion and steam. Add mince and fry. Season with salt and pepper. Chop the tomatoes a little bit in the tin.
Add wine, tomatoes and bay leaf to the mince. Bring to the boil once and simmer for 30 minutes at medium heat. Cook spaghetti in plenty of boiling salted water for eight to ten minutes. Shortly before the end of the cooking time, stir the crème fraîche into the minced sauce. Season to taste with salt and pepper. Drain the pasta and serve with the sauce. Sprinkle with grated parmesan