Lentils are legumes rich in fiber, minerals and vitamins. Source of iron, have a high nutritional value and antioxidant properties. 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.