Pisto is a Spanish ratatouille-like dish that is popular in Madrid. It is made with a variety of vegetables, such as tomatoes, bell peppers, zucchini, and onions, sautéed in olive oil and seasoned with herbs and spices. Pisto can be enjoyed as a side dish or as a main course, and it is often served with a fried egg on top. It is a flavorful and healthy option for vegetarians and vegans.