Cut the leek into small rings. Melt some clarified butter in a roaster. Break the minced meat into small crumbs and fry in the clarified butter until it starts to brown. Add the leek rings and sauté briefly. Add the tomatoes and tomato paste and bring to the boil while stirring constantly. Now season with salt, pepper and paprika and let it steep for 15 minutes on a low heat.
Meanwhile, cook the forked spaghetti in salted water according to the instructions on the packet. Drain but don`t put them off.
Spread fork spaghetti on deep plates and spread a good ladle of minced meat and leek on top and pour a teaspoon of sour cream on top.