restaurants have arisen, selling burgers produced from meat stated to be of high quality and often organic, usually served to eat on the premises rather than to take away. Chains include Gourmet Burger Kitchen, Ultimate Burger, Hamburger Union and Byron Hamburgers in London. Independent restaurants such as Meatmarket and Dirty Burger developed a style of rich, juicy burger in 2012 which is known as a dirty burger or third-wave burger. In recent years Rustlers has sold pre-cooked hamburgers reheatable in a microwave oven in the United Kingdom. In the UK, as in North America and Japan, the term "burger" can refer simply to the patty, be it beef, some other kind of meat, or vegetarian. Australia and New Zealand Fast food franchises sell American-style fast-food hamburgers in Australia and New Zealand. The traditional Australasian hamburgers are usually bought from fish and chip shops or milk bars rather than from chain restaurants. These traditional hamburgers are becoming less common as older-style fast food outlets decrease in number. The hamburger meat is almost always ground beef, or "mince," as it is more commonly referred to in Australia and New Zealand. They commonly include tomato, lettuce, grilled onion, and meat as minimum—in this form, known in Australia as a "plain hamburger," which often also includes a slice of beetroot—and, optionally, can include cheese, beetroot, pineapple, a fried egg, and bacon. If all these optional ingredients are included, it is known in Australia as a "burger with the lot." In Australia and New Zealand, as in the United Kingdom, the word sandwich is generally reserved for two slices of bread (from a loaf) with fillings in between them – unlike in American English where a sandwich is fillings between two pieces of any kind of bread, not only slices of bread – as such burgers are not generally considered to be sandwiches. The term burger is applied to any cut bun with a hot filling, even when the filling does not contain beef, such as a chicken burger (generally with chicken breast rather than chicken mince), salmon burger, pulled pork burger, veggie burger, etc. The only variance between the two countries' hamburgers is that New Zealand's equivalent to "The Lot" often contains a steak (beef). The condiments regularly used are barbecue sauce and tomato sauce. The traditional Australasian hamburger never includes mayonnaise. The McDonald's "McOz" Burger is partway between American and Australian style burgers,