Ratatouille is a traditional French vegetable stew that originated in the Provence region of France. It is made with a variety of vegetables, such as tomatoes, eggplant, zucchini, bell peppers, and onions. The vegetables are cooked slowly to preserve their flavors and are seasoned with herbs like thyme and basil. Ratatouille is a vibrant and healthy dish that showcases the freshness of the ingredients.