A lobster roll is a kin of sandwich filled with lobster meat. A traditional lobster roll contains the fresh cooked meat of a one-pound lobster, tossed with mayonnaise and served on a grilled hot dog bun or similar roll, served so that the opening is on the top rather than on the side. The filling may also contain diced celery and/or scallion, or use drawn butter instead of or in addition to the mayonnaise. The sandwich can also contain lettuce and lemon.