Heat up a heavy-bottomed pot (I used a 2 qt pot) to medium heat and sear all sides of the pork belly. Once browned, add all your ingredients: soy sauce, mirin, Chinese cooking wine, sugar, ginger, garlic, scallions, and optional spices like star anise, cloves, and dried cinnamon. Fill up the rest of the pot with water but make sure to leave about 2 inches at the top to prevent the liquid from boiling over. If using a larger pot, increase the amount of ingredients accordingly.
1 cup light soy sauce, ½ cup mirin, ½ cup Chinese cooking wine, 3 tbsp sugar, 2-3 ginger slices, 4-5 garlic cloves, 2 stalks scallions, 1 dried cinnamon stick, 3-5 cloves, 2-3 star anise, water