Yakitori Sauce

1. Combine Ingredients: In a small saucepan, combine the soy sauce, mirin, sake, and brown sugar.
2. Heat and Dissolve Sugar: Bring the mixture to a boil over medium-high heat, stirring to ensure the sugar dissolves completely.
3. Simmer and Thicken: Once boiling, reduce the heat to medium-low and let it simmer for about 10-15 minutes, or until the sauce has thickened slightly and has a glossy appearance.
4. Cool and Store: Remove the sauce from heat and let it cool. Transfer the cooled sauce to a clean bottle or jar. Store in the refrigerator until ready to use.

Chicken Skewers

1. Prepare Skewers: Thread the chicken pieces and green onions alternately onto the soaked bamboo skewers.

Different Cooking Methods

1. Grilling

1. Preheat Grill: Preheat the grill to medium-high heat. If using a charcoal grill, ensure the coals are evenly distributed and hot.
2. Grill Chicken Skewers: Place the chicken skewers on the grill. Grill for about 4-5 minutes per side, basting generously with the yakitori sauce during the last few minutes of grilling. Continue to turn and baste until the chicken is cooked through and nicely glazed.
3. Check for Doneness: Ensure the chicken reaches an internal temperature of 165°F (74°C) to ensure it is fully cooked.

2. Broiling (Oven)

1. Preheat Broiler: Preheat the broiler to high and position the oven rack about 6 inches from the heat source.
2. Broil Chicken Skewers: Place the skewers on a foil-lined baking sheet. Broil for about 5-6 minutes per side, basting with yakitori sauce during the last few minutes of cooking, until the chicken is cooked through and nicely caramelized.
3. Check for Doneness: Ensure the chicken reaches an internal temperature of 165°F (74°C) to ensure it is fully cooked.

3. Pan-Frying

1. Heat Pan: Heat a grill pan or skillet over medium-high heat. Lightly oil the pan.
2. Cook Chicken Skewers: Place the skewers in the pan. Cook for about 4-5 minutes per side, basting with yakitori sauce during the last few minutes of cooking, until the chicken is cooked through and nicely glazed.
3. Check for Doneness: Ensure the chicken reaches an internal temperature of 165°F (74°C) to ensure it is fully cooked.

4. Air Frying

1. Preheat Air Fryer: Preheat the air fryer to 400°F (200°C) for about 5 minutes.
2. Air Fry Chicken Skewers: Lightly brush or spray the air fryer basket with oil. Place the chicken skewers in the basket, ensuring they are not overcrowded.
3. Air fry for about 8-10 minutes, turning and basting with yakitori sauce halfway through cooking, until the chicken is cooked through and nicely glazed.
4. Check for Doneness: Ensure the chicken reaches an internal temperature of 165°F (74°C) to ensure it is fully cooked.

Serve

1. Remove the skewers from the heat and let them rest for a couple of minutes. Serve hot with additional yakitori sauce on the side.