In a large mixing bowl, combine the shredded rotisserie chicken, finely chopped celery, diced red onion, mayonnaise, and dill relish.
Stir everything together until the chicken is evenly coated and all are well combined.
Season generously with salt and freshly ground black pepper to your liking.
For the best flavor, cover the bowl and chill in the refrigerator for at least 1 hour. This allows all the flavors to meld together beautifully.
Serve cold on lettuce leaves, in a sandwich, or with your favorite crackers. Store any leftovers in an airtight container in the refrigerator for up to 5 days.
Don't be afraid to customize!
Add a handful of halved red grapes for sweetness, toasted pecans for crunch, or fresh herbs like dill or chives for a burst of freshness.