Japanese
Soak 12 bamboo skewers in water for 30 minutes.
Simmer the soy sauce, mirin, sake and sugar in a small pan for 8-10 minutes, until reduced by about a third and slightly syrupy; this is the tare.
Cut the chicken into 3 cm pieces and the green onions into 3 cm lengths.
Thread the chicken and onion pieces alternately onto the skewers, pressing them close together.
Grill over hot charcoal or under a hot broiler for 8-10 minutes, turning often, until the chicken is almost cooked through.
Brush or dip the skewers in tare 2-3 times, grilling 1 minute between coats, until glossy and lightly charred.
Serve hot, sprinkled with shichimi togarashi.