Watercress & Seaweed Soup | Cook for Your Life
Watercress & Seaweed Soup - Cook For Your Life- anti-cancer recipes

Watercress & Seaweed Soup

Rated 5 out of 5
5 out of 5 stars (based on 5 reviews)

Clock Icon for Prep Time 30 min prep
Person Icon for Serving Size 6 servings
Carrot Icon for Number of Ingredients Size 8 ingredients

My Chinese herbalist said I should eat seaweed during chemo, a cool food for my body to act as an antidote to the hot chemo drugs. Basically what he wanted me to eat was Kombu....

It’s distinctive taste tones down the seaweediness of the Kombu. You can, of course make this soup without the seaweed just skip step 1 and leave it out! The soup looks pretty too, olive green with flecks of bright green from the watercress leaves and parsley you add at the end.


  • 1 piece of kombu, rinsed well and wiped down with a paper towel
  • 1 to 2 bunches watercress, washed well
  • 1 medium onion, chopped
  • 2 medium or 1 large potato, washed and in a medium dice, like Yukon Gold
  • 1 tablespoon olive oil
  • 1 tablespoon chopped Italian parsley plus 2 teaspoons for garnish
  • 6 to 8 cups water or low-sodium chicken or vegetable stock
  • Salt and pepper, to taste
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Nutrition Facts


230 cals


6 g

Saturated Fat

1 g

Polyunsaturated Fat

1 g

Monounsaturated Fat

3 g


35 g


6 g


4 g


11 g


1055 mg


  1. Put the kombu seaweed into a pot and cover with 2 cups of cold water. Bring to a boil and cook for 3 to 4 minutes. Remove the seaweed. Set the water aside to use as part of the stock.
  2. Separate the tender leaves of the watercress from the tough stems. Set the leaves aside. Finely dice the stems.
  3. In a large wide pan, heat the oil over medium-high heat. When it ripples, add the onion and the diced watercress stems. Sauté until they start to soften. Add the potato, sauté to mix well.  Cover, and turn the heat down to medium-low. Sweat for 10 minutes, stirring from time to time.
  4. Add 6 cups of stock and 2 cups of the kombu cooking water. Add the reserved seaweed, cover and bring to a slow boil. Cook over a low heat until the seaweed is soft, about 10 minutes. Remove the seaweed from the pot and cut into a small dice. Set aside. When the potatoes are very tender, add ½ of the reserved watercress leaves and cook stirring until they wilt.
  5. Puree the soup in batches in a blender or directly in the pot with an immersion blender. Taste for seasoning. Heat the soup through and add the seaweed, cook for 2 minutes then add the remaining watercress leaves and chopped parsley. Cover, turn off the heat and let the soup sit for 5 minutes
  6. Serve the soup hot with a little yogurt or a knob of butter as a garnish. Sprinkle with a little extra chopped parsley.

Chef Tips

If your mouth is sore, don’t add the diced seaweed and cress leaves, just sip on the puree.

Registered Dietitian Approved

Our recipes, articles, and videos are reviewed by our oncology-trained dietitians to ensure that each is backed with scientific evidence and follows the guidelines set by the Oncology Nutrition for Clinical Practice, 2nd Ed., published by the Oncology Nutrition Dietetic Practice Group, a professional interest group of the Academy of Nutrition and Dietetics, and the American Institute for Cancer Research and the American Cancer Society

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