Preheat the oven at 350 F / 176 C.
Bake the pork for about 2 hours. Turn around the pork pieces every 20 minutes.
Strain the liquid and place it in small pot. Skim off the fat.
Mix 1 tsp. cornstarch with 1 tbsp. water. Bring the liquid to a boil and thick it with the cornstarch.