Combine all of the vegetables and wet ingredients in separate bowls.
Add the wet ingredients to the vegetables, cover and refrigerate up to 24 hours.
Bring a large pot of water to a boil and place the pork belly in to boil for 20 minutes.
Remove and allow to cool. Cut into 3-inch cubes and thoroughly dry with paper towel.
In a heavy bottom pot melt the rock sugar and vegetable oil, stirring constantly. Once the sugar starts to caramelize and turn light brown add the pork cubes and brown on all sides.
Add the ginger, shallot, garlic, onion and fry for 8-10 minutes until vegetables soften.
Add the remaining ingredients and bring to a boil, then reduce to a simmer and cover with a tight-fitting lid.
Braise for 3-4 hours until the pork belly is tender.
Remove the pork belly from the braising liquid to a cutting board and roughly chop, removing most of the skin and some of the larger fat chunks.
To serve: split each brioche bun and fill with pork belly chunks and sesame slaw.