Combine mayonnaise, cooked chicken, celery, sweet onion, grapes, walnuts, lemon juice, Dijon mustard, fine sea salt and white pepper in a large mixing bowl. Stir to combine.
Stuff 1 piece of lettuce and a tomato slice into each pita bread halve.
Spoon in chicken salad.
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Notes
Omit walnuts if there is an allergy. Use plain Greek yogurt or avocado instead of mayo for a lighter chicken salad.