Bobby Flay's grill guest is Long Island native and business school student Seth Koslow. Using flavorful flank steak, Seth recreates the Philly chese steak sandwich while Bobby impresses Seth with his Flank Steak in Balsamic BBQ Sauce. Plus twists on the grills favorite veggies: corn and potatoes. At cocktail time, Seth woos Bobby with his tropical creation, "Jeanie in a Bottle."