Rinse all the vegetables.
Chop the onion fairly finely.
Fry it in a frying pan over a low heat with a little olive oil. Stir from time to time.
Cut the bell peppers into small, thin strips.
Add the pepper strips to the onions and cook on a low heat for 10 to 12 minutes, stirring regularly. Once the peppers have melted a little, stop cooking and set aside.
Meanwhile, cut the eggplants into small cubes.
Fry them in a generous drizzle of olive oil in another pan. Stir also, adding a little more oil if the eggplants stick to the bottom of the pan. Cook them for about 15 minutes, until they become a little melting.
Cut the zucchini in half lengthways. Cut each courgette half in half again lengthways. Then chop the zucchini slices fairly finely.
Fry the zucchini pieces in another pan in a little olive oil for about 10 minutes, stirring constantly.
Finally, cut the tomatoes into small cubes and fry the tomatoes over a low heat in a little olive oil for 8-10 minutes, also stirring.
In a pot, pour a little olive oil, and add all the vegetables. Add salt, pepper and herbs. Then simmer for 15 to 20 minutes on a very low heat. It's ready!