american macaroni salad

Ingredients For american macaroni salad

• 2 c

  dry elbow macaroni, cooked, rinsed, and drained
• 1/3 c

  diced celery
• 1/4 c

  minced red onion, soaked in cold water for 5 minutes, drained
• 1 Tbsp

  minced flat-leaf parsley
• 1/2 c

  diced vine-ripened tomato (optional)
• 1/2 c

  mayonnaise
• 3/4 tsp

  dry mustard
• 1 1/2 tsp

  sugar
• 1 1/2 Tbsp

  cider vinegar
• 3 Tbsp

  sour cream
• 1/2 tsp

  kosher salt, plus more to taste
• freshly ground black pepper