1. lice chicken and marinade with soy sauce and oil for ten minutes.
2. Heat oil in a wok or a pan, add cashew nuts and roast until golden. Take nuts out of the wok and drain on a paper tissue.
3. Wash spring onions and cut into 2 cm long pieces. Wash tomatoes and mushrooms and dice.
4. Heat oil in a wok or a pan, add chicken and stir-fry for two minutes.
5. Add tomatoes, onions, mushrooms and cashew nuts and stir-fry.
6. Reduce heat and season with fish sauce, oyster sauce and sugar.