Let the pork belly sit uncovered in the fridge for at least 24-48 hours to dry out the skin.
Make a spice mix with the brown sugar, 2 tsp salt, ½ tsp garlic powder, and ½ tsp five spice. Rub this mixture all over the pork belly.
Make a salt crust by mixing 1 cup of kosher salt with 1 egg white.
Preheat the oven to 300°F.
Place the pork belly on a baking sheet and cover it completely with the salt crust.
Cook the pork belly in the oven for 1.5 hours.
Remove the salt crust, then brush the pork belly with ½ Tbsp of white vinegar and ½ Tbsp of neutral oil.
Increase the oven temperature to 450°F and roast the pork belly for 30-40 minutes, or until the skin is crispy.
