in Greece in the 1920s with the population exchange between Greece and Turkey, later transforming into gyros. It was not until a century after its invention that döner kebab was introduced and popularized in Istanbul, most famously by Beyti Güler. His restaurant, first opened in 1945, was soon discovered by journalists and began serving döner and other kebab dishes to kings, prime ministers, film stars and celebrities. It has been sold in sandwich form in Istanbul since at least the mid-1960s. The döner kebab and its derivatives served in a sandwich form as "fast food" came to worldwide prominence in the mid to late 20th century. The first doner kebab shop in London opened in 1966 and they were a familiar sight in provincial cities by the late 1970s, while gyros was already popular in Greece and New York City in 1971. A Greek-Canadian variation, the donair, was introduced in 1972, eventually becoming the official food of Halifax, and spreading across the country. By the 1960s, the taco al pastor in Mexico had evolved from the shawarma. In Germany, the döner kebab was popularized by Turkish guest workers in Berlin in the early 1970s. The dish developed there from its original form into a distinctive style of sandwich with abundant salad, vegetables, and sauces, sold in large portions at affordable prices, that would soon become one of the top-selling fast food and street food dishes in Germany and much of Europe, and popular around the world. Etymology In the English name "", the word doner is borrowed from the Turkish , with the Turkish letter ö usually anglicized as "o", though "döner kebab" is an alternative spelling in English. The word "" is used, which comes to English from the (kabāb), partly through Urdu, Persian and Turkish; it may refer to a number of different kebab dishes made with roasted or grilled meat. While kebab has been used in English since the late 17th century, doner/döner kebab is known only from the mid-20th or later. The Turkish word comes from dönmek ("to turn" or "to rotate"), so the Turkish name literally means "rotating roast". In German, it is spelled Döner Kebab; the sandwich is often called ein Döner. Particularly in British English, a döner kebab sandwich may be referred to simply as "a kebab". A Canadian variation is "donair". In Greek, it was originally called döner () but later came