Foong Kee is probably better known for their wanton mee but their roast meats are really awesome as well.
Their siu yok is well marinated and has a nice thin shatteringly crisp crackling even though I was there late in the day. Their char siew was also really good though not Fei Fei-good as a certain learned friend of mine would probably say.
If you are in the area and looking for some cheap and good food, you should most definitely check Foong Kee out!