Add the vegetable oil to a hot wok over high heat. Add the sliced onions, beansprouts and prepared noodles. Add the dark soy sauce, water, light soy sauce, sugar, msg, white pepper and spring onion.
1 tablespoon vegetable oil, 1/2 large onion, 100 grams beansprouts, 1 tablespoon dark soy sauce, 50 ml water, 1 teaspoon light soy sauce, 1/4 teaspoon sugar, 1/4 teaspoon msg, 1/4 teaspoon white pepper, 1 spring onion, 1 nest egg noodles