For the Zucchini Penne with Feta, cook penne according to package directions. Cut zucchini and leek into slices, halve zucchini slices.
Sauté leeks in a little butter and add zucchini briefly. Fry ketchup and add a little water. Add sour cream and bring to a boil. Add the herbs and mix in the finely chopped feta cheese.
Finally, season everything well. Simmer the tomatoes briefly and mix into the penne. Arrange the zucchini penne with feta cheese on a plate and sprinkle with some chopped basil!