2In a mixing bowl, combine the Koikuchi soy sauce, Sake, Mirin, finely grated Ginger, and finely grated Garlic. Add the cut Chicken thigh to the marinade, ensuring all pieces are well coated. Marinate for at least 30 minutes, or up to 1 hour for deeper flavor.
3Remove the Chicken thigh from the marinade, allowing any excess liquid to drip off. Place the Potato starch in a shallow dish and dredge each piece of Chicken thigh thoroughly, ensuring an even and complete coating.