Cook the noodles in a large pan of boiling water for 3-5 minutes, then drain and plunge them in cold water.
Drain the noodles thoroughly and toss them with the sesame oil. Arrange them on a platter or in a large bowl.
The sauce can be made in advance and kept refrigerated, as it is served cold. Just mix all the ingredients together in a bowl or electric blender. When ready to serve, pour the sauce on top of the noodles and toss well, then garnish with the spring onions.
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