Homemade ratatouille.

Finely chop the onion and sauté.

Finely chop the bell pepper and leek and add to the onion.

While the onion, leek and bell pepper are frying, cut the zucchini and eggplant into small cubes. Add to the previous mixture.

Sauté for about 15 minutes. Meanwhile, peel and dice the tomatoes. Add them to the vegetables and let them simmer until they lose the water. Add salt to taste.