Bring a large pan of water to the boil, then blanch the lotus root, mushrooms, carrot, broccoli and mangetout for about 1 minute. Drain and put to one side.
Heat a wok, add a little vegetable oil and stir-fry the vegetables and ginger for a minute or so, then add the oyster sauce, soy sauce, vinegar, rice wine, sake or sherry, the sugar and salt and stir well.<