Cook the noodles in a large pot of boiling water, allowing 3 minutes for fresh noodles and 5 minutes for dried. Drain in a colander, rinse with cold water, and toss them with a little sesame oil. Set them aside.
Heat a wok or large frying pan over high heat. Add the two oils and, when very hot, add the ginger. Stir-fry for 10 seconds. Add the scallions and stir-fry for 30 seconds longer. Remove from the heat and mix in the noodles. Season with salt and pepper and finally add the oyster sauce. Mix well.