Place the pork belly in a bowl, pour in the Shaoxing rice wine and soy sauce, mix well and leave to marinate for half an hour.
In a wok or frying pan, heat the cooking oil.
Spread the shallot slices in the hot oil and cook, stirring occasionally, just until starting to brown.
Stir in the garlic and cook for half a minute.
Push the shallots and garlic on one side of the pan and spread the marinated pork in the hot oil.
Leave for half a minute then stir everything together. Cook until the pork belly is starting to brown along the edges.
Pour in the rice wine and soy sauce.
Add the cinnamon stick and star anise.
Pour in two cups water and stir in the sugar.
Bring to the boil, lower the heat, cover and simmer until the pork is tender.
Turn up the heat to medium.
Stir in the shiitake and hard-boiled eggs.
Cook, uncovered, until the sauce is thick and sticky.