Blanch the pork belly in boiling water for about 3 minutes to remove impurities. Remove and set aside.
Heat a wok or pan with some cooking oil, add the rock sugar, and melt it over low heat.
Once the rock sugar has melted, add the pork belly pieces and pan-fry until both sides are slightly golden.
Add ginger slices and garlic cloves, and stir-fry for a moment.
Add cooking wine and cook for a few minutes to remove any unpleasant smell.
Add light soy sauce and dark soy sauce, and stir-fry until well combined.
Add enough water to slightly submerge the pork belly.
Bring to a boil over high heat, then reduce the heat to low. Cover the wok or pan and simmer for about 1.5 hours, or until the pork belly is tender and flavorful.
Adjust the saltiness according to personal preference.
Remove the pork belly from the sauce and pan-fry it in another pan until the surface is slightly crispy for added flavor.
Slice or cut the pan-fried pork belly into pieces, and serve on a plate.