For the pork belly, blanch whole slab of pork belly for 10 minutes. Then cut into cubes of approximately 1 inch X 2 inch.
To sear pork belly, preheat cooking oil in a pan. Turn off heat and add blanched pork belly in. Sear pork belly at medium heat and use the pan cover to protect yourself from popping hot oil. Once you have crispy edges, turn off the heat and transfer pork belly to container.
For the Chinese preserved mustard, rinse off the salt in a bowl of water twice. Then soak in water for 2 hours or more. After soaking, remove from water and cut into uniform sizes.
Prepare the rest of the ingredients.
Cooking
With the leftover oil from searing pork belly, add Chinese preserved mustard and pan-fry to aromatic fragrance.
Then add sugar and caramelize at low heat.
Switch to high heat and then as quickly as possible, add soy sauce, shao xing wine, and then water.
Add star anise into the stew.
Bring to a full boil then reduce heat to a simmer.
Keep covered and simmer for 90 minutes.
After 90 minutes, remove star anise and separately transfer pork belly, Chinese preserved mustard, and gravy into the container.
Plating
With a clean plate, begin to place pork belly at the center of the plate.
Gently place Chinese preserved mustard around the pork belly.
Then spoon some gravy over the pork belly and in a heaping drizzle some of the gravy at the side of the plate.
As a garnish, sprinkle some chopped spring onion and serve.