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 g fat (24% calories from fat), 8 g protein, 34 g carbohydrate, 4 g fiber, 0 mg cholesterol, 350 mg sodium