
Photo by Romulo Yanes
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)
Cooks' notes:
• 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.

