Indeed, they were popularized in Hong Kong via Macau: Custard tarts derived from the Portuguese pastry were introduced in Hong Kong in the 1940s by cha

Indeed, they were popularized in Hong Kong via Macau: Custard tarts derived from the Portuguese pastry were introduced in Hong Kong in the 1940s by cha chaan tengs via the Portuguese colony of Macau. https://en.wikipedia.org/wiki/Egg_tart#History https://en.wikipedia.org/wiki/Egg_tart#History