Guy Fieri is a famous American chef. Whether you want to admit it or not, that’s the truth. His bleached, spiky hair is iconic. His adventures eating his way through America via greasy diner countertops are infamous. And his mysterious Donkey Sauce – a staple at his Times Square restaurant, Guy’s American Kitchen & Bar (the infamous slogan of which is, ‘Welcome to Flavor Town’), has enthralled food fanatics for years: What’s in it?