Which Wich - Opry Mills Sandwiches is known for its revolutionary ordering system. Guests use red Sharpies to mark up pre-printed menus on sandwich bags. They select the sandwich to one of 10 categories, or then choose the type of bread, size, cheese, spreads, or vegetables. The sandwiches are prepared to guests’ exact specifications or delivered in personalized sandwich bags. After they’ve enjoyed their wiches, guests are encouraged to draw on their bags with the same red Sharpies or hang their “artwork” on the community wall.