The perfect burger

A word of advice. Never use the phrase "just a burger" with Nancy Silverton. I did and was promptly challenged on every aspect of burger-making, starting with where to buy the meat, what grind, size of patty, how to cook it, what to serve with it, what pickle, what bun, what ketchup, what mayonnaise, what mustard, what cheese, how thick to slice the avocado, what bacon, what smoke on the bacon, what occasion.