Want to have a bite of the world's most expensive sandwich? Then, pay a visit to the McDonald outlet near you. The McDonald sandwich, named after its creator Scott McDonald, the chef at London department store Selfridges is said to be the world's most expensive sandwich. The healthy sandwich consists of wagyu beef, fresh lobe foie gras, black truffle mayonnaise, brie de meaux, rocket, red pepper and mustard confit and English plum tomatoes. BBC reports that there have been least five advance orders placed for the 21oz meal that costs £85.