Ingredients

  • 1/2 bunch watercress, tough stems removed, coarsely chopped (about 2 cups)
  • 4 anchovy fillets packed in oil, drained
  • 1/2 cup mayonnaise
  • 2 tablespoons sour cream
  • 1/2 cup (lightly packed) fresh flat-leaf parsley leaves
  • 2 tablespoons chopped fresh chives
  • 2 tablespoons chopped fresh tarragon
  • 1 tablespoon white wine vinegar
  • Kosher salt, freshly ground pepper

Method

  • Puree watercress, anchovies, mayonnaise, sour cream, parsley, chives, tarragon, and vinegar in a blender until smooth; season with salt and pepper.
  • Do ahead: Dressing can be made 2 days ahead. Transfer to a jar; cover and chill.