LONDON -- Britain's Prince William has served up a surprise to hungry members of the public when he dished out environmentally friendly burgers from a food truck in south London. In a video released on Sunday, the heir to the throne handed out "Earthshot Burgers" to highlight the work of last year's winners of his annual Earthshot Prize, which he set up to help develop solutions to major environmental problems. "Coming right up," the prince said as he served up the burgers to the stunned customers. "Morning everyone, nicely cooked, ready to go." The object for William, who had teamed up with the founders of YouTube channel Sorted Food which revi...Keep on reading: Burger king: Prince William serves up food to surprised diners