After working in some of London’s best-loved restaurants, Max Halley realised that the sandwich, humanity’s greatest invention, was due a renaissance. In 2015 Max opened Max’s Sandwich Shop in Crouch End, London. He features creations such as the Ham, Egg ‘N’ Chips: slow-cooked ham hock, fried egg, piccalilli, shoe string fries and malt vinegar mayo. We talked about his sandwich philosophy, what's wrong with sourdough and the best things to blend into mayonnaise.