Add the peas, watercress and water to a pan.

Boil the water, then turn to a simmer and cook for approximately 5 minutes.

Add the soup mix to a food blender and blend until smooth. You can leave it slightly chunky or turn into a puree.

Add the soup mix back to the pan to bring to medium heat. Add a little more water if desired. Season to taste.

Serve and garnish with watercress on top of the soup.