Cut the chicken into 4 cm (1½ in) pieces. Combine all the marinade ingredients in a bowl, add the chicken and mix well. Leave to marinate in the refrigerator for at least 30 minutes (or overnight). Stir the marinade and chicken again well before frying, as the potato starch tends to settle on the bottom of the bowl. Pour a 5 cm (2 in) depth of oil into a large saucepan and