In a sauce pan combine soy sauce and sugar. Bring to a boil and stir to dissolve sugar. Cool. Set aside 1/4 cup.
Combine 3/4 cup of soy sauce mixture with mirin, garlic and ginger. Place in blender and blend until smooth.
Pour mixture over chicken in a zipper bag. Marinate for at least one hour to overnight.
Grill chicken. Slice and pour reserved sauce over top.
Video
Notes
You can use boneless, skinless chicken breasts if you prefer.Add in some veggies:My favorite veggies to add are bell peppers, broccoli, mushrooms. Saute them in some light oil until tender and then serve them with the chicken over the rice.