Having just watched Hester Blumenthal creating his 'perfect' hamburger, arguments have broken out all over our house.
Here in South Australia, the classic 'burger with the lot' - from a burger bar or made at home - includes bun, patty, onion (caramelised and/or raw - each brings their own element and has it's own supporters) cheese, tomato, pickled beetroot and lettuce, all soused in tomato sauce (ketchup).
Popular additions include egg and pineapple. Mayo, pickles and bacon are also available, but less popular.
The essential salad element after the tomato and lettuce is beetroot - Hungry Jacks (the local franchise of Burger King) has caved to local tastes, and even Maccas (McDonalds) has periodic specials featuring beetroot.
So what constitutes the 'perfect' burger in your part of the world?