In a heavy-bottomed pot or deep pan, add the diced pork belly. Pan-fry over medium-low heat until the color changes and some fat starts to render.
Add ginger and garlic, stir fry for 30 seconds to release the aroma.
Stir in the shiitake mushrooms, then add soy sauce, dark soy sauce, rice wine, and rock sugar. Toss everything together until evenly coated.
Add the spice pack (or five-spice powder), star anise, bay leaves, and cinnamon stick.