Stir together salt and sugar and rub all over the pork. Wrap it tightly in plastic wrap and refrigerate for at least 4 hours.

Preheat oven to 350 degrees.

Rinse pork belly with cold water and pat dry. Place on a baking rack in a rimmed baking sheet lined with foil. Cover the pork in foil and roast for 1 hour and 30 minutes.

In a small saucepan over medium heat, bring the sauce ingredients to a simmer and cook until thickened, approximately 6 to 8 minutes.

Once pork is roasted, remove from the oven and raise temperature to 450 degrees.

Brush pork with the sauce and place back in the oven, uncovered, for 10 minutes. Remove pork, flip it and brush with more sauce. Roast for another 10 minutes. Remove the pork again, flip it and brush with sauce. Roast for 15 minutes until the top is crispy.

Sprinkle with a bit of salt and serve over rice with any remaining sauce and scallions.