1 c. mayonnaise
2 tbsp. vinegar
1 tsp. sugar
1 tsp. salt
1/4 tsp. pepper
8 oz. elbow macaroni, cooked, drained
1 c. sliced celery
1/4 c. chopped onion
1 can white tuna

Combine first 5 ingredients. Stir in remaining ingredients. Cover and chill before serving.

Makes about 5 cups.