$120 egg sandwich: Pricey, but is it the world's most expensive sandwich?

$120 egg sandwich: A chef in Australia has created a lavish bacon-and-egg sandwich for Sydney's Bacon Week which costs $120. While made with gourmet ingredients, the sandwich doesn't break the 'most expensive sandwich' record.

This is no Egg McMuffin.

In celebration of Sydney's Bacon Week, one chef is rolling out a limited-time-only $120 bacon-and-egg sandwich that easily puts all breakfast sandwiches to shame and most burgers in their place.

"It's not something I ever thought I'd be doing but it will be interesting to see how many we'll sell," Carla Jones, head chef at 4Fourteen restaurant in Sydney suburb Surry Hills told The Sunday Telegraph. "I reckon some people will buy it just to see what it's like. I'm not sure I'd eat it — I'm not that into truffles and stuff like that."

The lavish sandwich served on a homemade brioche bun includes award-winning bacon, a duck egg, gourmet tomatoes, foie gras, shaved truffles, caviar, creme fraiche, and cheese. The dish, a cross between a breakfast sandwich and a burger, will only be available during Bacon Week, May 12-19. The event organizers, the Australian pork industry association, have dubbed the sandwich "Australia’s most decadent bacon and egg roll."

While Jones' sandwich is certainly extravagant, it's not record-breaking. That title still seems to be up for grabs. The World Record Academy recognized the Bacon Bling sandwich at Tangberry's cafe in Cheltenham in western England, as the world's most expensive bacon sandwich. According to the Huffington Post, it sells for £150, or about $235.

But the Bacon Bling sandwich has not been recognized by Guinness World Records, which doesn't have a separate category for bacon-based sandwiches. The current Guinness-winning sandwich is the Essen Platinum Club Sandwich, created in 2007 by Chef Daniel Galmiche for Cliveden in Buckinghamshire, England. It costs £100 or $200.

While there's no official wallet-busting, record-breaking sandwich in the US, in 2012 the Food Network put together a list, complete with interactive map, of the 50 best sandwiches in America, one sandwich for each state.

The winner in California, from Los Angeles restaurant Bäco Mercat, is "the toron" sandwich, featuring oxtail hash, cheddar taters, and horseradish for a modest $13. Food Network's winner in New York is a humble chicken parmigan from from Parm, a Manhattan restaurant in NoLita. The sandwich is served on a roll for $9, as a hero for for $12, or on a platter for $17.

But chefs beware, the real competition for best – or most expensive – sandwich may soon come from laboratories rather than kitchens. The New York Times reported scientists in the Netherlands are developing a burger made from in-Vitro meat, meat grown in cultures. The burger will be made up of 20,000 strips of cultured muscle tissue, at a cost of 250,000 euros, or about $325,000 for just one sandwich.