When it comes to sandwiches, there's no denying the Publix sub is a Florida gem. Known to many as simply the "Pub-sub," the sandwich's most defining characteristic is perhaps the use of fresh-baked submarine rolls. Stacked with a variety of meats, cheeses, condiments and toppings, they're freshly prepared and served in generous portions and satisfying flavor combinations. But even longtime fans of the Pub-sub might not know Publix offers a game-changing bread upgrade over its standard roll.