Creating delicious coleslaw dressing is simple and can be done in just a few steps:

1. Gather Ingredients: Collect all the ingredients listed above.
2. Mix Mayonnaise and Vinegar: In a medium bowl, whisk together the mayonnaise and apple cider vinegar until smooth.
3. Add Sweetness: Stir in the sugar until fully dissolved.
4. Incorporate Flavorings: Add the Dijon mustard, celery seed, salt, and black pepper. Mix until everything is well combined.
5. Taste and Adjust: Taste the dressing and adjust sweetness or acidity as desired. You can add more sugar or vinegar based on your preference.
6. Add Fresh Herbs: If using, fold in the chopped fresh parsley for an extra touch of color and flavor.
7. Chill: For best results, let the dressing chill in the refrigerator for at least 30 minutes before serving. This allows the flavors to meld beautifully.

Following these steps will lead you to the perfect coleslaw dressing that complements your salad wonderfully.