Peel and chop the onions. Wash and cut the zucchini. Wash and core the peppers and cut them into small pieces. Wash and chop the herbs.
Steam the onions until translucent, add the zucchini and peppers and sauté briefly. Cut the tomatoes into pieces and add to the vegetables. Add the tomato paste, sugar and herbs and let the sauce simmer for 10 minutes. Season to taste with chilli, salt and pepper.
Fry the salmon fillet well in oil, place on a plate with the vegetable sauce and serve with rice or potato pancakes.