Heat half of the butter in a skillet over medium heat. Add the onion and cook until tender for about 4 minutes. Add the watercress, peas, parsley, and hot broth or water, bring the mixture to a boil, and when it reaches a rolling boil, reduce the flame to low, or until the peas are bright green.
Add the double cream, mix well. Season to taste with salt and freshly ground black pepper. Then add the remaining butter until it melts.
Nutritional Information
* * Information per 100g serving, percentage of daily values based on a 2,000 calorie diet.
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