Question: What else can go in burgers besides beef?
About the article "Hamburger", section "Variations".

Candidate passages:
 1969–1978: "Quality Is Our Recipe" (this slogan is still shown on the Wendy's logo today.)
1978–1979: "Juicy hamburgers" 1979–1980: "Hot-N-Juicy" 1980–1981: "Wendy's Has the Taste You Crave" 1981–1982: "Ain't No Reason to Go Anyplace Else" 1982–1985: "You're Wendy's Kind of People" 1983–1984: "Parts is parts" 1984–1986: "Where's the beef?"
1985–1988: "Choose Fresh, choose Wendy's" (Originally used alongside "Where's the Beef?")
1987–1993: "Give a little nibble" was to be a catchy phrase that would capture the attention of consumers and help make Wendy's major player on the fast-food scene once again.
This television commercial was a flop and sent Wendy's hunting for a new advertising agency.
After a poorly received seven-week run, Wendy's pulled the television commercials created by Dick Rich Inc.
The "nibble" spots were meant to emphasize Wendy's better-tasting hamburger.
They showed customers ripping off chunks of meat from an absurdly large hamburger.
1988–1992: "The best burgers in the business."
1989–1998: "The best burgers and a whole lot more" (also was printed inside the hamburger wrappers during the 1990s) 1996 - 1998: "The Best Burgers Yet!!"
1997 – Present: "You can eat great, even late" 2001–2005: "It's hamburger bliss."
2002–2005: "It's better here" 2003–2007: "It's Always Great, Even Late."
(Canada) 2005–2007: "Do what tastes right."
(primary slogan) 2005 – Present: "It's good to be square."
January 2007 – October 2007: "That's right."
January 2007 – October 2007: "Uh Huh."
2007–2008: "Hot Juicy Burgers" January 2008 – October 2009: "It's waaay better than fast food...
It's Wendy's."
(US) January 2008 – October 2009: "It's waaaaaaaaaay delicious.
It's Wendy's."
(Canada) January 2008 – October 2009: "Carrément bon.
C'est Wendy's."
(EN: "Squarely good.
It's Wendy's.")
(Quebec, Canada)  October 2009 – April 2012: "You know when it's real."
April 2012 – Present: "Now that's better."
The menu consists of burgers made with organic meat, fresh cut french fries cooked in olive oil, a burger that can be made with as many as 10 patties ("vertigo" burger), two kinds of veggie burgers and hand-blended milkshakes.
The meat for non-vegetarian burgers is USDA-certified organic, grass fed, free range beef and the cheese is 6 month aged cheddar.
The beef is cooked on griddles heated by steam, rather than gas flame, for ensuring a more uniform surface temperature and faster temperature recovery.
The veggie burgers are cooked in a conveyor, keeping them away from the griddle where beef is cooked.
The fresh french fries are cooked in olive oil, after a process patented by Hans Hess.
The milkshakes are made from hand-scooped ice cream. 
South America.
McNífica is served.
McDonald's Argentina serves Big Tasty Angus Burguer, made with premium Argentinean Angus Beef.
Argentina is the only country besides Israel in which McDonald's has full kosher locations.
These are the only places in the world where McDonald's burgers are barbecued on charcoal rather than fried. 
The Ramly Burger, also known as the Burger Ramly, is a Malaysian burger created by Ramly Mokni popular in Malaysia.
Though the term "Ramly Burger" may refer to any of the hamburgers sold in a Ramly Burger stall, it most commonly refers to the "Ramly Burger Special".
While the amount and type of ingredients vary greatly depending on location, a typical Ramly Burger consists of a beef or chicken patty, margarine, onions, an egg, cabbage, mayonnaise, Worcestershire sauce and Maggi Seasoning.
The burgers are a local delicacy, especially among the Malay community.
"Burger Ramly" started out in 1979 as a small family business operated from a mobile kiosk on Lorong Haji Hussein in Kuala Lumpur.
The Ramly Burger is distinctive from most other hamburgers due to the unique way in which the ingredients are served.
Rather than the usual method of stacking the ingredients within the bun, the patty in the Ramly Burger is first covered with the desired condiments, then wrapped in a thin layer of egg.
Besides the Burger Special, Ramly Burgers can also be served in conventional way, with the patty being cooked together with ingredients like Worcestershire sauce, curry powder or some pepper as flavorings.
What makes Ramly Burgers so special is that every Ramly Burger tastes differently from different stalls, thus appeals to a specific group of people.
Ramly Burger is very localized and every stall is very simple and is commonly found along a busy road or under a tree. 
In Japan, hamburgers can be served in a bun, called "hanbāgā" (ハンバーガー), or just the patties served without a bun, known as "hanbāgu" (ハンバーグ) or "hamburg", short for "hamburg steak".
"Hamburg steaks" (served without buns) are similar to what are known as Salisbury steaks in the USA.
They are made from minced beef, pork or a blend of the two, mixed with minced onions, egg, breadcrumbs and spices.
They are served with brown sauce (or demi-glace in restaurants) with vegetable or salad sides, or occasionally in Japanese curries.
It is may be served in casual, western style suburban restaurant chains known in Japan as "family restaurants".
Hamburgers in buns, on the other hand, are predominantly the domain of fast food chains such as American chains known as McDonald's and Wendy's.
Japan has home grown hamburger chain restaurants such as MOS Burger, First Kitchen and Freshness Burger.
Local varieties of burgers served in Japan include teriyaki burgers, "katsu" burgers (containing tonkatsu) and burgers containing shrimp korokke.
Some of the more unusual examples include the rice burger, where the bun is made of rice, and the luxury 1000-yen (US$10) "Takumi Burger" (meaning "artisan taste"), featuring avocados, freshly grated wasabi, and other rare seasonal ingredients.
In terms of the actual patty, there are burgers made with Kobe beef, butchered from cows that are fed with beer and massaged daily.
McDonald's Japan also recently launched a McPork burger, made with U.S. pork.
McDonald's has been gradually losing market share in Japan to these local hamburger chains, due in part to the preference of Japanese diners for fresh ingredients and more refined, "upscale" hamburger offerings.
Burger King once retreated from Japan, but re-entered the market in Summer 2007 in cooperation with the Korean owned Japanese fast-food chain Lotteria.