From Complete Chinese Cookbook, p. 345
Cook the fresh or dried noodles for 3-5 minutes in a pan of boiling water
Cool them in cold water and drain them thoroughly, then toss them in the sesame oil and put them aside until ready to use
Mix the sauce ingredients together, along with 1 teaspoon each of salt and black pepper, in a bowl or in an electric blender
This can be done in advance and then refrigerated, as the sauce is meant to be cold
Pour the sauce over the noodles and toss well
Garnish with the spring onions and serve
If you wish to make this ahead of time, keep the sauce and noodles separate, tossing them at the last moment