Watercress (Xi Yang Cai) Soup

Ingredients:
1 bunch of watercress (xi yang cai)
pork ribs (rinsed and scalded with boiling water)
8 red dates
1 tbsp wolfberries
6 cups water
salt to taste

Methods:
1. Bring the water to boil.
2. Add in pork ribs, watercress, red dates and wolfberries. Continue boiling for 15-20 minutes.
3. Reduce the heat to low and simmer for 1 hour.
4. Season with salt before serving.