1-1/2 pounds boneless skinless chicken breast
1/2 cup barbecue sauce
1 cup mayonnaise
1/2 cup finely chopped onion
1/2 cup chopped celery
1/4 teaspoon salt
1/4 teaspoon crushed red pepper flakes
8 kaiser rolls, split
8 tomato slices
8 lettuce leaves
Place the chicken in a shallow baking dish; add barbecue sauce. Turn to coat; cover. Refrigerate overnight.
Grill chicken, covered, over medium-high heat until a thermometer reads 165°, 6-8 minutes on each side. Cool; cover and refrigerate chicken until chilled.
Chop chicken; place in a large bowl. Stir in the mayonnaise, onion, celery, salt and pepper flakes. Serve on rolls with tomato and lettuce.