1.5 lb chicken breast - skinless, boneless, halves
1.) Place the chicken in a large resealable plastic bag; add barbecue sauce. Seal the bag and turn to coat. Refrigerate overnight.
2.) Grill chicken, covered, over medium-hot heat for 6-8 minutes on each side or until juices run clear. Cool; cover and refrigerate chicken until chilled.
3.) Chop chicken; place in a bowl. Stir in the mayonnaise, onion, celery, salt and pepper flakes. Serve on rolls with tomato and lettuce.