Stir-fried prawns and bok choy with sweet pork, basil and shallots

A straightforward dish that uses the quick-and-easy method of stir-frying. Sweet pork (red roast pork or cha siu) is available from Chinese roast-meat shops, where ducks, chickens and various meats hang in the window. The meat is glazed with maltose and soy before being roasted, giving the surface a caramelised, reddish appearance. Buy the meat in one piece and slice it as you are about to cook it. If you have several small, non-stick woks, available from Asian food stores, you can cook a f