Simple Watercress Soup with Seafood Mushrooms and Jujube

Watercress Soup is so simple to make, and my ingredients are super simple too. I added jujubes (dates) for color and sweetness. You may substitute with slices of carrot. Enjoy!
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Ingredients:
1/2 lb Watercress
1/3 lb seafood mushroom or other mushroom
4 jujubes (dates)
3 stalks green onions
4 slices ginger
sesame oil
salt
vegetable oil