2 kilos (about 4 pounds) of fava beans in their pods 1 lar peeled and diced 1 small onion, peeled and diced 2 celery stalks, diced 1/2 cup chopped smoked pancetta 4 garlic cloves, peeled and minced 2 tablespoons olive oil salt & pepper red pepper flakes (optional) 2 (14 ounce) cans chopped tomatoes 1/2 cup chopped