"There's no need to trim the watercress; you can use every bit of it in this recipe. Active time: 30 min Start to finish: 2 3/4 hr(includes chilling)..."
INGREDIENTS
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1 small boiling potato (1/4 lb), peeled and cut into 1/2-inch pieces
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1 small onion, finely chopped
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2 cups (16 fl oz) low-sodium chicken broth
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1 cup heavy cream
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4 cups coarsely chopped watercress (1 large bunch)