Bobby Flay gives his culinary assistants from Throwdown a day off to go head-to-head for a grilled sandwich showdown. Stephanie Banyas builds a colossal Pittsburgh Cheesesteak, an homage to a hometown favorite, while Miriam puts together a Greek-inspired Grilled Patty Melt with Kasseri Cheese and Muhammara. On Bobby's menu is a Grilled Eggplant and Mozzarella on Ciabatta with Warmed Potato Chips dipped in a homemade Gorgonzola Cheese Sauce. And for dessert, the showdown continues with two tasty versions of a campfire classic -- S'mores!