Step 1

Add the chicken to a bowl, along with the mirin, soy sauce, dark soy sauce, brown sugar, ginger, sesame oil, and cornstarch. Mix together until all the ingredients are well combined. Allow to marinate for 2 hours.

Step 2

Heat the oil in a wok or large skillet over medium high heat. Transfer the chicken to the pan in one layer (reserving the marinade), and allow it to sear on one side for 1 minute. Then start stir-frying for another minute.

Step 3

Add the reserved marinade to the pan, reduce the heat to medium, and simmer to reduce the sauce until it thickens and coats the chicken. Serve over rice!