Heat 1 tbsp of the oil in a wok or large frying pan over a medium-high heat. Fry the cashews for a few minutes, tossing, until deep golden. Use a slotted spoon to scoop out onto a plate. Add the remaining oil to the wok and, once hot, fry the chicken for 4-5 minutes, tossing regularly, until really golden brown. Scoop out onto a plate.