An Australian entrepreneur who received a patent for the bun of his hamburger-hotdog hybrid is now offering franchises. Mark Murray first introduced his idea of a cross between a hamburger and hotdog on a show called Shark Tank, where entrepreneurs try to sell their ideas to celebrity investors. Though the Sharks refused to invest in the hybrid snack, Murray began selling his Hamdog at fairs and markets in Australia. To fit on the patented bun, a sausage is placed in between two halves of a burger patty. Traditional hamburger and hotdog condiments are placed on top of the meat.