Chick-A-Boom’s chicken sandwiches, cooked to order and well-packaged for travel, are lavishly topped with Provolone cheese (which they torch), pickle, coleslaw, scallions, and a Thousand Island-like “Boom” sauce. There’s a wide variety of sauces, including mango habanero, honey barbecue, and sweet Thai chili. Many napkins are required.