These Portuguese Egg tarts are literally the first and last thing I eat in Hong Kong on just about every trip. At $9 HKD a piece, I rarely buy any less than 5 at a time and even then it may not be enough. Hands down my favorite food - snack or otherwise - in Hong Kong and the first thing I think of when I touch down at the airport.

http://www.openrice.com/english/restaurant/sr2.htm?shopid=11664