When people think of Cantonese food, buttery scrambled egg between slices of soft white bread may not be the first dish to come to mind. For Lucas Sin Lok-yeung, this quintessential Hong Kong classic is the first recipe in his inaugural cookbook, Cha Chaan Teng: Comfort Food from Hong Kong’s Iconic Diners – listed as the “Perfect Scrambled Egg Sandwich”. Sin, 33, has been a staunch advocate of Hong Kong cuisine for more than a decade, starring in a long list of YouTube videos – from explaining...