Follow these simple steps to create your own Japanese Chicken Yakitori:

1. Marinate the Chicken: In a bowl, combine soy sauce, mirin, sake, and sugar. Mix well until the sugar dissolves. Add the chicken thighs, ensuring they are well-coated. Let them marinate for at least 30 minutes.
2. Prepare the Skewers: While the chicken is marinating, soak bamboo skewers in water to prevent burning. This step is crucial for grilling.
3. Preheat the Grill: Heat an outdoor grill or indoor grill pan over medium-high heat. Make sure it’s hot before adding the skewers.
4. Skewer the Chicken: Remove the chicken from the marinade (reserve the marinade) and cut it into bite-sized pieces. Thread the chicken pieces onto the soaked skewers, alternating with green onion pieces.
5. Grill the Chicken: Place the skewers on the grill. Cook for about 5-7 minutes per side, basting with the reserved marinade while grilling. Ensure the chicken is fully cooked.
6. Check for Doneness: Use a meat thermometer to ensure the chicken reaches an internal temperature of 165°F (75°C).
7. Remove from Grill: Once cooked, remove the skewers from the grill and let them rest for a few minutes.
8. Garnish: Sprinkle sesame seeds over the skewers for added flavor and presentation.
9. Serve: Place the skewers on a serving platter.

These steps will guide you in creating Japanese Chicken Yakitori that will impress your family and friends effortlessly.