0.3 lb potato boiling peeled cut into 1/2-inch pieces
4 cups watercress coarsely chopped (1 large bunch)
Equipment
bowl
sauce pan
sieve
blender
Directions
Simmer potato, onion, broth, and cream, uncovered, in a 3- to 4-quart heavy saucepan until vegetables are soft, about 10 minutes. Stir in watercress and cook mixture, uncovered, over moderately low heat 3 minutes more.
Purée soup in 2 batches in a blender until very smooth, about 45 seconds per batch (use caution when blending hot liquids). Force soup through a fine-mesh sieve into a bowl, pressing hard on solids and then discarding them. Season with salt and pepper and let soup stand, uncovered, until cool, 45 minutes, then chill, covered, 1 1/2 hours.
• Soup can be chilled quickly in a metal bowl set in a larger bowl of ice and cold water. Stir occasionally for 15 minutes, then remove from cold water and refrigerate, covered, until cold, about 30 minutes. • Soup can be chilled, covered, up to 2 days.
