Cook noodles in a large saucepan of simmering salted water according to packet directions until just tender. Drain and rinse under cold running water to cool and separate noodles. Transfer to a large bowl, add prawns, cabbage, carrot, cucumber and spring onion, and toss to combine.
Step 2
For sesame-miso dressing, whisk ingredients in a bowl and thin with 1-2 tbsp hot water for a drizzling consistency. Drizzle dressing over salad to taste, toss to combine and serve scattered with roasted sesame seeds and extra spring onion.