Watercress soup is a very nourishing soup that is easy to cook. Watercress soup is believed to have a ???cooling??? effect on the body. Watercress is packed with anti-oxidants and vitamins. Also, it is said to have detoxifying and cancer-preventing properties as well. Because watercress is quite strong in fragrant and flavour, I have decided to cook it with chicken. However, it can be cooked with pork ribs too.