Cut the chicken into small, equal-sized cubes. Blend the egg white and cornflower together with half the rice wine or sherry. Marinate the chicken in this mixture, making sure all the pieces are covered in the marinade.
Heat the oil in a wok over medium-high heat and briefly stir fry the cashew nuts until they are golden brown. Remove and set aside. Using the same oil, stir fry the spring onion, garlic and ginger for 30 seconds. Add the chicken and fry for a further 2 minutes. Add the rest of the rice wine and soy sauce and stir well. Finally stir through the cashew nuts and let it simmer for 30 seconds. Serve immediately with steamed rice.