Boil several skin-on chicken breasts until cooked. Let it cool and drain well. Remove the skin and cut the chicken into small pieces. Having the skin on makes the chicken much more moist.
Add chopped celery, onion if desired, and enough mayo to make the chicken quite moist. (The mixture will thicken in the fridge overnight.) Add some fresh ground pepper. Add a few handfuls of salted cashews. Add half or quartered grapes. Gently turn mixture together and refrigerate overnight.
Taste the mixture in the morning to see if it needs more seasoning