1 (7 oz.) pkg. elbow macaroni
2 tbsp. vinegar
1 c. diced American cheese
1/2 c. chopped green pepper
1/4 c. diced celery
2 tbsp. chopped pimiento
2-3 tbsp. minced onion
2/3 c. mayonnaise

Cook macaroni according to package directions. Drain and rinse with cold water. Add vinegar, mix lightly. Let stand 10 minutes. Add the cheese, chopped green pepper, diced celery, pimiento, onion and mayonnaise. Toss to blend. Chill.