Things You Will Need
Trim down the watercress to get rid of unneeded stems, as this will provide you with a healthy bunch of greens.
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Snip off the stems of the watercress with a knife or scissors. Snip the hollow stems until you begin to reach the leafy foliage.
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Place the watercress into a colander. Rinse thoroughly with cool water, tossing the watercress with your hands for an even rinse.
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Fill a large bowl with a solution of 2 tbsp. white vinegar per 2 qt. cool water. Place the greens inside, and let soak for 30 minutes. This will remove any dirty smell or taste from the watercress.
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Pour the watercress into the colander. Rinse thoroughly once more with cool water.