1.Place prawns in a medium bowl with sauce, oil, chilli, coriander root and stem mixture, ginger and garlic. Toss to coat prawns in mixture. Refrigerate 30 minutes.
2.Meanwhile, to make lime dressing, whisk together lime juice, palm sugar and fish sauce in a small bowl.
3.Cook prawns in heated large frying pan, in batches, until changed in colour.
4.Place prawns in large bowl with dressing and remaining ingredients; toss gently to combine.