Wash the zucchini, cut in half lengthways and cut into 4 - 5 mm wide slices. Finely dice the onion and sauté in a little oil, add the zucchini slices and fry for 2 - 4 minutes. Dust the flour over it and fry briefly, add the cream, vegetable stock and mustard and cook covered for approx. 8 minutes.
Cut the salmon fillet into 2.5 cm cubes, add to the zucchini and cook for 7 - 8 minutes on a low heat. Season to taste with salt, pepper, lemon juice and Maggi and fold in the parsley before serving.