1. Remove the leaves from the Chinese cabbage, discard any wilted leaves or ones with browned spots. Lay several of the leaves on top of one another, and cut crosswise into thin strips.
2. Remove the stem from the bell pepper. Cut the bell pepper in half and remove the seeds and white pith from the middle. Cut the bell pepper lengthwise into thin strips.
3. In a small bowl, combine the white wine vinegar, rice wine or dry sherry, soy sauce, sugar and hot chilli oil. Set aside.
4. Heat the wok and add oil. When the oil is hot, add the chopped ginger. Stir-fry for about 10 seconds, until the ginger just starts to become aromatic. Add the cabbage. Stir-fry for a minute, then add the red bell pepper. Stir-fry for another minute, or until the cabbage is tender but still crisp. Add a pinch of salt to the cabbage during stir-frying if desired.
5. Give the sauce a quick re-stir and swirl it into the wok. Cook, stirring to mix everything together. Serve immediately.