Taken from this ramen recipe I found online.
Mix everything but the pork belly in a bowl to combine
Tie the pork belly into a roll using string
If the roll is too big to fit into your sous vide plastic bags, you may need to cut it up into pieces
Pour the marinade into the bag with the pork and vacuum seal it
Set your sous vide water bath to 170 degrees Fahrenheit (76.7 C)
Cook the pork for 10-12 hours
Remove the bag from the water bath, and refrigerate pork for several hours
Once the pork has chilled, it should be much easier to slice into think pieces which can be served with ramen or maybe made into a very tasty sandwich?