You won't find this at Halo Burger. Guinness has named the world's most expensive hamburger, a dish available only at 'Serendipity 3' in New York.

The cost? Brace yourself:

$295! (Don't forget to tip your server.)

Try this on for size:

It 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 burger is topped off with a solid gold "Fleur de Lis" toothpick, encrusted with diamonds.

Serendipity is actually donating all the profit (there might be a slight markup) from sales of the burger to the Bowery Mission, which helps feed hungry and homeless people in New York.