The most expensive hamburger is Le Burger Extravagant which sells for $295.00 (£186.52) at Serendipity 3 in New York, New York, USA, as of 22 May 2012.
The hamburger is made from white truffle butter-infused Japanese Wagyu beef and topped with James Montgomery cheddar cheese, black truffles and a fried quail egg. It is served on a gold-dusted campagna roll spread with white truffle butter. The roll is topped with a blini, creme fraiche and caviar.
Comments below may relate to previous holders of this record.