Yakitori

Bahan-bahan (4 porsi)

• ¾ cup soy sauce
• ¼ cup + 2 tablespoons mirin (sweet rice wine)
• ¼ cup + 2 tablespoons sake
• ¼ cup + 2 tablespoons (packed) light brown sugar
• 1 -in piece fresh ginger, peeled and sliced
• 2 cloves garlic, peeled and smashed
• 1 bunch scallions, cut into 1-in (2.5-cm) pieces, light and dark green parts separated
• 1 tablespoon cornstarch combined with 1 tablespoon cold water
• 2 lbs boneless, skinless chicken thighs, cut into 1-in (2.5-cm) pieces
• 8 to 10 metal or bamboo skewers, (if using bamboo, soak in water for 30 minutes)
• Sesame seeds, optional for serving (toast for more flavor if you like; see note)