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Shred the meat from the leftover chicken legs, and discard the skin and bones. Bring a pan of water to the boil and cook the noodles following pack instructions. Drain the noodles and cool in cold running water.
Mix together the wasabi, soy sauce, sesame oil, lemon juice and sugar until the sugar has dissolved.
Toss the cooled noodles with the dressing and arrange on a serving plate. Top with the chicken, chilli, spring onions and coriander. Toss everything through just before serving.