Preheat oven 350ºF & turn on grill

Season chicken with salt, pepper, and oil. Grill mark the chicken on both sides and then place in the oven for 20 minutes; cool and dice small

Dice celery and onions and place in a mixing bowl. Add the remainder of the ingredients and combine thoroughly. Dice cooled grilled chicken into small pieces, add to the bowl, stir into the mixture, season, and let stand for 2 hours. Serve with lettuce wraps or your favourite crackers