A few days later, when I was eating Peking duck pancakes at my new excellent Chinese discovery, Bright Courtyard in Baker Street, I thought about how that assembly of soft and crispy duck with a pliant wrap, squeak of spring onion, damp of cucumber and tang of hoisin satisfies the gastronomic soul in much the same way. Let's not get carried away here, you might think, but the chilli cheeseburger is a spirited meal for £7 which needs only a few extras.