Prepare pasta as package directs. Rinse and drain. Add onion, celery, parsley and olives. Combine mayonnaise, mustard and vinegar. Add to pasta and vegetables. Adjust seasoning with black pepper and salt, if desired. Chill 1 hour before serving.
Great served with Eden Baked Beans!
Per serving - 212 calories, 6 gram fat (24% calories from fat), 8 gram protein, 34 gram carbohydrate, 4 gram fiber, 0 milligram cholesterol, 350 milligram sodium