1. Wash and cut the zucchini, eggplant, green and red bell peppers into medium-sized cubes. Quarter the tomatoes and thinly slice the onion.
2. In a pan, pour a little olive oil and sauté each vegetable separately for 5 minutes to brown them. Start with the bell peppers, then the eggplant, zucchini, and finally the onions and tomatoes, which you will cook together.
3. After cooking the vegetables, add them all to the tomatoes and onions, reduce the heat, and mix. Add a nice bouquet garni of thyme, rosemary, and bay leaf, season with salt and pepper, then cover and simmer for 40 minutes, stirring regularly.
4. About 10 minutes before the end of cooking, add the two crushed garlic cloves, then cover again. Don't hesitate to taste and season again according to your taste.