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$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  restaurant in Sydney suburb Surry Hills ³Ù´Ç±ô»åÌý. "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  recognized the Bacon Bling sandwich at Tangberry's cafe in Cheltenham in western England, as the world's most expensive bacon sandwich. , 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. 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, , of the 50 best sandwiches in America, one sandwich for each state.

The winner in California, from Los Angeles °ù±ð²õ³Ù²¹³Ü°ù²¹²Ô³ÙÌý, 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 , 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.  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.