Zuppa di lenticchie, piselli e fave
dried lentils (about 150 grams; preferably small red or green lentils) • peas, fresh or frozen (about 150 grams) • fava beans, fresh or frozen (about 150 grams) • onion • carrots • celery stalk • Extra-virgin olive oil, • vegetable broth (about 1 liter) or water