Cut the chicken breasts into 2.5 cm 1 in cubes. Combine them with the rice wine, soy sauce, sesame oil and cornflour; refrigerate for about 20 minutes.
Heat a wok or large frying pan until it is hot, then add the groundnut oil. When the oil is slightly smoking, add the chicken pieces, stirring vigorously to keep them from sticking. When the chicken pieces turn white, after about 3 minut