Cook pasta according to package instructions, drain and rinse under cold water.
While pasta is cooking prepare the dressing by simply whisking together all ingredients or combing in a blender or food processor
In a large bowl, gently toss the pasta with with setian if using, peas, scallions, water chestnuts, sesame seeds and red cabbage.
Pour the dressing over the pasta and toss well. Cover and place in the refrigerator.
Best served cold after marinating in the refrigerator for at least a couple of hours or overnight.