Sprinkle the 5-spice powder over the gammon pieces.
Put a few sprays of cooking oil into a wok or large frying pan.
Cook the gammon over a high heat for around 2-3 minutes until the edges are slighty browned.
Add the soy sauce, honey, red chillies, orange zest and juice and stock and simmer for 4-5 minutes or until the sauce becomes sticky and the gammon is glazed and golden (with slightly burned edges if you like that sort of thing).
Serve straight away with pak choi and cooked egg noodles,
and any pan juices poured over