OH siu yok is epic easy.
* not my pics..
BOIL the piece of pork belly with tons of salt.
once done. let it it dry... DRY it for hours.
then use a nice paper towel and wipe the skin(on top) dry. then use a fork, and POKE THE SHIT OUT OF IT.
set on Broil, set on top rack. it will bubble.
again, i have years of experience doing this, it does tons of trial and error. it's NOT hard to make it crack with the crispy skin. the KEY to success is
1) Marinade it really salty cause when you boil it it loses favor
2) you will notice when you go out and eat, they "pre-cut" sections and marinade the shit out of it.
it's hard ot explain but they score the meat side and put a lot of seasoning.
lastly, keep trying till you succeed.