Watercress Salad
["2 bunches watercress", "1 Tbsp. Dijon mustard", "2 Tbsp. red wine vinegar", "salt and pepper to taste", "4 Tbsp. oil", "1 hard-boiled egg, peeled and chopped", "2 Tbsp. chopped onion"]
["Trim off the tough ends of the watercress and discard.", "Rinse the leaves and tender stems.", "Drain well.", "Put mustard, vinegar, salt and pepper in salad bowl.", "Blend with wire whisk.", "Add oil, beating with whisk.", "Add watercress, chopped egg and onion.", "Toss and serve."]
["bunches", "mustard", "red wine vinegar", "salt", "oil", "egg", "onion"]