7.5cm/3in piece fresh ginger, unpeeled
4 spring onions
750ml/1 pint 7fl oz chicken stock
pinch freshly ground black pepper
1 stick cinnamon or cassia bark
3 tbsp groundnut oil
125ml/4fl oz dark soy sauce
1 whole star anise
2 tsp sugar
1kg/2lb 4oz pork belly, rib bones removed
3-4 tbsp Shaoxing wine (substitute dry sherry if unavailable)