3/4 c. mayonnaise
2 tbsp. vinegar
1 tbsp. mustard
1 tsp. sugar
1 tsp. salt
1/8 tsp. pepper
1 c. sliced celery (or 1/2 c. diced celery)
1/4 c. chopped red pepper
1/4 c. chopped onion
1/4 c. shredded carrots, optional
8 oz. cooked, drained macaroni

In a large bowl, mix the first 11 ingredients well. Add macaroni, and toss lightly. cover; chill.