Peel and wash the carrots. Clean and wash the leeks and chop them finely. Peel and chop garlic. Heat the oil in a large pan. Press sausage meat in balls from the skin directly into the hot oil. Fry well all around. Take out and let drain on kitchen paper. Cook the noodles in boiling salted water according to the instructions on the packet
Add carrots, leek and garlic to the hot frying fat and fry. Add the tomato paste and sauté while stirring. Deglaze with tomatoes, season with salt, cayenne pepper, sugar and fennel. Add the meatballs and let everything simmer for 8-10 minutes
Wash the basil, dab dry, put something aside for garnishing. Cut the rest into fine strips. Drain the pasta and let it drain. Season sauce again. Mix the pasta and basil into the sauce. Sprinkle with parmesan and serve garnished with basil