I'm going to make another potentially controversial statement here: Honolulu has one of the best 叉燒 or char siu in Central, and perhaps on Hong Kong island, even.
Char siu is also known as barbecue pork or asado in Filipino. I have no idea what it's called in other languages. Why do I make this claim? Every time I've been at Honolulu (and I've been going for years), I've never been disappointed. The pork (or soya chicken or roast duck) is always consistently succulent and fatty. I've never had a dry or burned piece (although some people apparently like the burned bits). The portions are great and the price is very good.
From 11 in the morning till 2 in the afternoon (I think), you can get a lunch set for HKD49 that includes a salty egg, vegetables, soup, 2 choices of barbecue and a hot drink. An extra HKD3 will get you a cold drink.
Otherwise, a bowl of barbecue and rice will run you between HKD25 to HKD30.
I must confess that I've never eaten anything else at Honolulu. One more thing I should note: they stop serving barbecue stuff at around six in the evening. The restaurant itself is open till quite late, about eleven or twelve midnight.
This is what I ate. Barbecued pork and roast duck. Don't be misled by the photograph, the bowl is a lot deeper than it looks.
Whew! I was wearing a tight dress and was a bit concerned that I wouldn't be able to finish. Very satisfying meal. You'll notice that I barely dipped into the sweet sauce for the duck. That was because the duck was so flavourful that any additional condiments would have ruined it.
One caveat: Honolulu makes really delicious milk tea, however, it's also a bit of a time bomb in your stomach. Most of the people I know have had to rush home after drinking it. I myself avoid the milk tea when I can't return home within an hour.
Honolulu Cafe is in Central on Stanley Street quite close to the escalator.