Preheat oven to 350 degrees. Place all ingredients except the pork and oil in a flameproof casserole dish. Bring to a boil and add pork making sure it is fully submerged. Add water if necessary. Cover with foil, place in oven, and roast for 3 hrs.
Remove pork from casserole and heat up a saute pan over high heat. Add oil and sear pork for 4-5 minutes on each side. Portion pork into ½ inch cubes.
Meanwhile, strain roasting liquid and reduce by half. Whisk in roux to thicken.
Place cabbage in bowl with salt and sugar. Transfer to colander and let drain for 1 hour. Transfer back to bowl with remaining ingredients.
Place small amount of cabbage in spoon bowl. Top cutlery with Pork Belly and garnish with sauce.
