In response to the question "what constitutes a gourmet burger?", Unibake development chef , Davor Zidaric, created the Umami Burger.
This inspired the London gourmet burger restaurant, Burgershack, to make his burger part of their special menu, naming it "Truffle Deluxe":
"Our latest special marries the rich flavour of our aged beef and bone marrow patties with tangy Keen's cheddar, earthy portabello mushrooms, sharp red onions and an almighty dollop of truffle mayo.
It's indulgent, it's delicious, it's a gastronomic delight – behold, the Truffle Deluxe!"