In a bowl add the sugar, oyster sauce, fish sauce and chicken stock.
Heat a wok and add a little oil, once sizzling add the dried chillies, followed by the garlic.
Slice chicken into 1 inch cubes. Add the chicken slices in small amounts and stir fry until golden. Remove chicken from wok.
In the empty wok, add the cashew nuts and stir fry, followed by the lemon grass. Add the bowl of sauces then the chicken. Stir fry until all the sauces are covering the chicken, Add the remaining ingredients including the spring onions and stir fry a further minute.