Delicious Macaroni Salad Recipe: Uncover the Secret Ingredients!

1. Cook the macaroni according to the package instructions. Drain and rinse with cold water.

2. In a small bowl, whisk together the mayonnaise, apple cider vinegar, Dijon mustard, salt, and pepper.

3. In a large bowl, combine the cooked macaroni, chopped red onion, chopped celery, chopped green bell pepper, and chopped parsley.

4. Pour the mayonnaise mixture over the macaroni mixture and stir until well combined.

5. Cover the bowl with plastic wrap and refrigerate for at least 1 hour.