Add bread crumbs. Refrigerate for one hour. With wet hands, shape into 4 burgers. Cook 3 minutes on each side on grill lightly brushed with oil. Celery salt Marinate the vegetables in the marinade for at least 2 hours.
Grill vegetables on both sides over medium-hot coals until they are tender and slightly charred.
Lightly grill the bread. Layer the vegetables in the bread. Sprinkle with celery salt.