This is the Christos Nikko Burger on Rye bread. It came in a pita pocket but i was not in the mood for it so I slapped it on toasted rye with some swiss and voila. Awesomeness. THE NIKKO BURGER at CHRISTOS GREEK RESTAURANTS: A Juicy six-ounce patty topped with grilled onions, sauteed mushrooms and American cheese. Served on a Kaiser Bun.