For the omelette, heat vegetable oil in a hot wok until the surface seems to shimmer slightly. Pour lightly beaten eggs into wok and leave to cook on base of wok for 30 seconds, without stirring. Using a spatula, fold omelette over onto itself and leave to cook for another 30 seconds. Fold over again and leave for 20 seconds or until almost set. Repeat once more before lifting omelette from wok onto a serving platter.
First, make the sauce. Heat peanut oil in a hot wok until surface seems to shimmer slightly. Add garlic and ginger and stir-fry for 2 minutes. Add sugar and allow to caramelise for 30 seconds. Add tomatoes and spring onions and stir-fry for 1 minute. Add shao hsing wine, shoyu and vinegar and stir-fry for 30 seconds. Stir through sesame oil and set sauce aside.
After preparing the omelette, gently reheat sauce, then spoon over omelette and serve immediately.
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