Place noodles in a bowl, cover with boiling water and set aside for 10 minutes, drain and refresh. Place in a bowl, add the shredded chicken and set aside.
Step 2
In a separate bowl, combine vinegar, fish sauce, oil, garlic, ginger, orange and lemon zest and juice, chilli and lemon grass. Add onion and herbs to noodles, pour over dressing and toss well.