Mom's macaroni salad

2 c dry elbow macaroni cooked, rinsed, and drained
1/3 c diced celery
1/4 c minced onion (red)
1/2 c diced tomatoes
1/2 c mayonaise
3/4 t dry mustard
1 1/2 t sugar
1 1/2 T cider vinegar
3 T sour cream
Salt
Pepper
1/2 c Shredded cheese

Combine macaroni, celery, onion, and tomato
In a small bowl whisk together mayo, mustard, sugar, vinegar, sour cream, salt & pepper.
Pour over macaroni & mix well.  Add cheese.