- 2 teaspoons white-wine vinegar
- 1 tablespoon Dijon mustard
- 2 tablespoons olive oil
- 1 bunch watercress, coarse stems discarded, washed well and spun dry (about 3 cups)
- 1 celery rib, sliced thin crosswise
- 1/4 cup fresh flat-leafed parsley leaves, washed well and spun dry
- In a bowl whisk together vinegar, mustard, and salt and pepper to taste and whisk in oil until dressing is emulsified. Add watercress, celery, and parsley and toss to combine well.