Remove all white and dark meat from one rotisserie chicken. This will yield about 4 cups of meat. Shred meat with 2 forks and set aside.
Gather the quartered grapes, diced red onion, diced celery, and chopped walnuts.
In a small mixing bowl, add the mayonnaise, white vinegar, salt and pepper.
Whisk all dressing ingredients to combine.
Pour dressing ingredients over the shredded chicken, grapes, celery and walnuts.
Toss all ingredients together until evenly coated. Enjoy on a sandwich or on top of lettuce greens for a filling salad.
