Hide your wallets! New York's Serendipity 3 restaurant has invented the world's most expensive burger according the Guinness Book of World Records, clocking in at a shocking $295.

The burger, invented in honor of National Hamburger Month (otherwise known as May), features a patty of Japanese Waygu beef infused with 10-herb white truffle butter and seasoned with Salish Alderwood smoked Pacific sea salt. It's topped with cheddar cheese, hand-made and cave-aged for 18 months by famed cheesemaker James Montgomery of Somerset, England. There are also shaved black truffles, a fried quail egg, a blini, creme fraiche, Kaluga caviar and a white truffle-buttered Campagna roll.

The final touch? Wait for it -- a solid gold "Fleur de Lis" toothpick, encrusted with diamonds, designed by world-renowned jeweler Euphoria New York. Seriously.

Serendipity isn't trying to cash out; they're donating all profits to the Bowery Mission, which serves homeless and hungry New Yorkers.

"Today" co-hosts Kathie Lee Gifford and Hoda Kotb have already tried the burger, racking up a nearly $600 tab in the process. After one bite, Kotb exclaimed, "I just ate eighty dollars."

The burger joins the ranks of other seriously expensive fare at Serendipity, which to date has included an opulent $1,000 sundae and a $69 hot dog.

Also on HuffPost:

2011: The year in burgers:

Smashburger, A Smash Success
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Last month, Forbes declared that Smashburger was "America's Most Promising Company." The rapidly-growing fast food chain isn't just expanding in the U.S., the company is opening outposts in three countries in the Persian Gulf: Kuwait, Bahrain and Saudi Arabia. The concept of Smashburger is simple, yet smart. You can choose from various items on the menu, or you can build-your-own burger with a variety of sauces, cheese, etc. If you haven't yet heard much about Smashburger, it sounds like you will be hearing more and more in the future.
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