Ratatouille Provencale - cooking recipe

Ingredients

1/2 cup extra-virgin olive oil
2 large onions, quartered
3 cloves garlic, minced
2 pounds fresh tomatoes, quartered
3 eggplants, sliced into 1/2-inch rounds
6 zucchini, sliced 1/2-inch thick
1/2 cup tomato puree (optional)
3 tablespoons herbes de Provence
salt and ground black pepper to taste

Preparation

Pour olive oil into a large pot over high heat. Add onions and garlic and saute for 2 minutes. Reduce heat and add tomatoes, eggplants, zucchini, tomato puree, herbes de Provence, salt, and pepper. Cover and simmer for 30 minutes.
Uncover and check the level of liquid in the pot. Continue cooking for 30 minutes, uncovered if there is too much liquid, or covered if the amount of liquid looks right.