Wash eggplant, zucchini, tomato, onion, and other vegetables thoroughly and cut them into bite-sized pieces.
Heat olive oil in a pan and sauté onion and garlic.
Add the eggplant and zucchini, and stir-fry.
Add tomatoes and herbs (such as basil and thyme).
Season with salt and pepper, and cook over low heat until the ingredients become tender.
Transfer the finished ratatouille to a plate and serve.