Maxi that Doner Kebab you mentioned isn't acttually a Turkish invention, it sounds to me like a corruption of the Adana Kebab, which is lamb, with lettuce, red cabbage, onions, the white yogurt sauce, and the red spicy sauce, served in Pita bread (or flatbread if you so prefer to call it), pretty much what you described, but this particular dish has been around for a good 100 years cause, the Turkish restaurants in New York have been serving for years and according to my Turkish friends has been around since Ottoman times.