Question: How are burgers served in Mexico?
About the article "Hamburger", section "Mexico".

Candidate passages:
In Mexico, burgers (called "hamburguesas") are served with ham and slices of American cheese (locally called "queso americano") fried on top of the meat patty.
The toppings include avocado, jalapeño slices, shredded lettuce, onion and tomato.
The bun has mayonnaise, ketchup and mustard.
In certain parts are served with bacon, which can be fried or grilled along with the meat patty.
A slice of pineapple is also a usual option, and the variation is known as a "Hawaiian hamburger".
Some restaurants' burgers also have barbecue sauce, and others also replace the ground patty with sirloin, Al pastor meat, barbacoa or a fried chicken breast.
Many burger chains from the United States can be found all over Mexico, including Carl's Jr., Sonic, as well as global chains such as McDonald's and Burger King.
Burger Heaven is a family owned diner-style burger restaurant in New York City, established in 1943.
In 2009 the chain operated six locations in Midtown Manhattan and the Upper East Side, though in recent years some locations were closed and the number of locations in May 2012 has been reduced to 3.
There is a separate and unrelated "Burger Heaven" restaurant in Alberta and British Columbia, Canada that was established in 1984 and serves poutine.
Menu offerings at "Burger Heaven" include pizza burgers, chili burgers, veggie burgers, "classic beef burgers" and turkey burgers as well as an array of salads, hot and cold sandwiches such as grilled cheese, tuna melts, triple-deckers, and chicken salad.
The burgers are served on kaiser buns and the milk shakes are "paradisiacal".
Breakfast is served until 11 a.m. and omelets are available any time.
New York magazine describes the decor as "nostalgic 1990s-meets-1950s" noting that:there's something about the bright yellow Formica tables, chrome fixtures, banquettes covered in cobalt vinyl, and light blue cloud-mural ceiling that does seem to bring you closer to that imaginary meat-patty paradise promised by the restaurant's name. 
All burgers consist of one or more 1/8 lb beef patties cooked to "medium-well", and served on a toasted bun.
The standard style of burger includes tomato, hand-leafed lettuce and "spread", a sauce similar to Thousand Island dressing.
In addition, customers are asked if they wish to add raw or grilled onions. 
The zoo has 8 theme sites:  "Burgers' Dierenpark" (the original zoo).
"Burgers' Safari" (a safari park).
"Burgers' Bush" is a indoor tropical rainforest.
"Burgers' Mangrove" (a mangrove swamp).
"Burgers' Desert" is a indoor desert (focusing on the Sonoran Desert).
"Burgers' Ocean" is a seawater aquarium.
Two of the main tanks are the ocean with sharks and other fish, and the coral reef with tropical fish, living corals and other invertebrates.
"Burgers' Avonturenland" (the zoo's playground), opened in 2002).
"Burgers' Rimba" (the zoo's newest attraction), opened in 2008.
The "Rimba" gives visitors an impression of a Southeast Asian rainforest.
The animals in this display include Sumatran tigers, sun bears, binturongs, Golden-cheeked Gibbons, dusky leaf monkeys, Sri Lankan leopards, golden jackals, banteng, muntjac, hog deer, Eld's deer, siamang, pig-tailed macaque, reticulated python, and water monitor.
"Burgers' Kids Jungle (Indoor playground in the theme of a South-American village, opened in 2012)  
In places such as India where vegetarianism is widespread, McDonald's and KFC serve veggie burgers.
Since February 2010, McDonald's Germany, its fourth-biggest global market, is serving veggie burgers in all its restaurants.
Different kinds of veggie burgers are also served permanently in McDonald's restaurants in: Bahrain UAE Egypt (McFalafel, consisting of a falafel patty with tomato, lettuce and tahini sauce) Greece (McVeggie, consisting of a breaded and fried vegetable patty with tomato, iceberg lettuce and ketchup, in a sesame bun) Malaysia The Netherlands (Groentenburger=Vegetable Burger) Sweden (McGarden) Switzerland (Vegi Mac)