2 cups dry elbow macaroni, cooked, rinsed, and drained 1/3 cup diced celery 1/4 cup minced red onion, soaked in cold water for 5 minutes, drained 1 tablespoon minced flat-leaf parsley 1/2 cup diced vine-ripened tomato (optional) 1/2 cup prepared mayonnaise 3/4 teaspoon dry mustard 1 1/2 teaspoons sugar 1 1/2 tablespoons cider vinegar 3 tablespoons sour cream 1/2 teaspoon kosher salt, plus more to taste Freshly ground black pepper Ingredients
Directions