UK food truck owner Tom Warwick had epicure's eyes a pinwheeling after unveiling a 3,180-calorie burger whose buns entail six Krispy Kreme donuts. Everyone loves a donut burger but I wanted to go bigger and better," Tom Warwick, 29, told Southwest News Service of his high-octane concoction, which is on offer at his food truck Meat Castles in Retford, Nottinghamshire.