[debono]

too much sugar in these food.
not properly bbq during cny period when demand is so high they employ non trained people to bbq.
turn out like charcoal.

it is also happening to those char siew stall. they dip the entire chunk of char siew into sugar solution to increased weight and when bbq these sugar turn black black.  really consumption of these black burn carsinogenic food is harmfull. don't say eat little is ok.  little bit little bit add together is like a small mountain

Those bak kwa that are not properly barbecued, may be burned black, and this is a cause of cancer..............