In the world of gastronomy, names can be notoriously deceptive. Just as a Welsh Rabbit contains no trace of meat and a pineapple bun contains no fruit, Hong Kong’s kitchens are home to a fascinating culinary misnomer. While some locals still refer to the city’s piped gas as mui hei—literally translating to “coal gas”—the town gas we use daily hasn’t actually been derived from coal for...