According to Guinness book of World records, the most expensive hamburger ever served was in New York restaurant Serendipity 3.
It is called ``Extravagant burger`` and it is being sold at the price of 295 US dollars. Next to beef meet, which is the main ingredient, the other ingredient which makes this burger unique are white truffle butter, caviar, fried quail eggs, handmade cheese 18 months old.
Interesting information is that this burgers is served by diamond encrusted toothpicks which are designed by ``Euphoria New York`` jewelry store.
