1. In a bowl, combine the lobster, mayonnaise, salt, pepper, and celery.
2. Spread the butter on both flat sides of the rolls. Heat a heavy skillet. Set in the rolls, flat sides down. Cook 2 minutes or until golden. Turn and cook the other side in the same way.
3. Let the rolls cool for a few minutes. Divide the lobster salad between the rolls, tucking it into them so they're very full.