Wash the fillet of beef, dab dry and cut into thin strips. Peel and halve the shallots. Wash and clean the zucchini and peel thinly with a peeler. Cook the pasta in boiling salted water for 8-10 minutes.
In the meantime, heat the oil in a pan and fry the fillet strips in it bit by bit in portions. Remove and season with salt and pepper. Sauté the shallots in the frying fat. Deglaze with white wine.
Add stock and cream and bring to the boil. Stir starch with 1 tablespoon of water until smooth and thicken the stock. Heat the fat in a pan and sauté the zucchini strips in it. Drain the pasta, let it drain and mix with the courgette strips.
Season with salt and pepper. Cut the tomatoes into pieces. Bring the fillet sauce to the boil, add the tomatoes and fillet strips and warm them up. Arrange zucchini noodles with tenderloin tips and sauce on a plate.
Sprinkle with green pepper to taste and garnish with parsley.