Place noodles in large heatproof bowl of boiling water, stand until just tender; drain. Rinse under cold water; drain.
Meanwhile, for sweet chilli dressing place ingredients in screw-top jar; shake well.
Combine noodles, cucumber, carrot, sprouts, prawns, herbs and sweet chilli dressing in large bowl; toss gently.
Serve sprinkled with peanuts.
You will need to buy about 1kg of unpeeled prawns for this recipe, buy pre-prepared prawns to save on preparation time. The dressing can be made two days ahead; assemble close to serving.Note