The beans are legumes rich in protein, vitamins and minerals. Delicious and very little calories, their high fiber content promotes bowel activity. Broken and deprived of their outer skin, the time of soaking and cooking decreased. To prepare a traditional soup it is recommended that you put them to soak at least 12 hours before cooking. Rinse and cook for about 40 minutes with herbs that improve the digestibility, then add salt. Finally, add tomato sauce, celery, extra-virgin olive oil and the ingredients provided by the recipe.