1. Season chicken breasts with salt and pepper, and cook in a frying pan until done, turning over halfway through the cooking. When chicken is cooked and cooled, cut into chunks.
2. Return to frying pan, and add 1 cup of barbecue sauce. Turn on flame, and let the sauce coat all the chicken pieces and caramelize them while stirring, until there is no sauce left in the pan. Chicken pieces should be nice and sticky. (If necessary, add a little more sauce to achieve this.)
3. Arrange the barbecue chicken pieces on top of the lettuce and veggies.