Peel carrots. Clean and wash the celery. Cut vegetables into very small cubes. Peel and finely dice onion.
Heat the oil in a large frying pan and stir-fry the minced meat for 5-8 minutes until crumbly. Add vegetables and onion, dust with paprika and fry for 2-3 minutes. Stir in tomato paste and sauté briefly.
Add the tomatoes, juice, stock and roast paste, bring to the boil and simmer for 15-20 minutes, stirring continuously. Season to taste with salt, pepper and sugar.
Meanwhile cook the pasta in 3-4 l boiling salted water (approx. 1 teaspoon salt per litre) according to the instructions on the packet. Whip cream until semi-solid. Grate the Parmesan cheese on a grater or (best with a peeler) slice it into thin shavings.
Drain the spaghetti and let it drain. Arrange on four (preferably preheated) deep plates. Serve with bolognese. Place a blob of cream on each plate and sprinkle with parmesan.