American Macaroni Salad

INGREDIENTS

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