Drizzle the meat with a little soy sauce and season with salt and pepper. Cut the leek into rings and wash. Peel the onion, cut in half and cut into strips.
Cook the pasta until al dente according to the instructions on the packet, drain and set aside. Cook the leek in a little salted water for about 4 minutes and set aside.
Heat the oil in a large pan and fry the meat until it has turned a nice color. Then deglaze with the vegetable stock and add paprika powder and simmer until the liquid has almost boiled down. At the same time, fry the onion strips in a small pan in a little butter until light brown. When the vegetable stock is almost overcooked on the meat, add the cream and the cooked pasta. Stir in the leek and onions. Let simmer briefly, if necessary, season again and then serve.