Heat a small drizzle of oil in a saucepan on a medium high heat. Fry the spring onions, garlic, ginger, chilli, coriander, chilli flakes and white pepper for around 3 minutes.
If using raw chicken, add this to the pan with the soy sauce and stir fry until sealed (it does not need to be fully cooked at this stage)
Add the potatoes and stir. If using cooked chicken, add now.
Add the soy sauce, fish sauce, mirin, sweet chilli sauce and sriracha and then add the chicken stock.
Simmer for 10 minutes or until the potato is cooked through.
Taste and adjust the seasoning. Add lime juice and sesame oil and stir through.