01 - In a small saucepan, combine soy sauce, mirin, sake, sugar, garlic, and ginger. Bring to a boil over medium heat, then simmer for 8–10 minutes until slightly thickened. Remove from heat and discard garlic and ginger.
02 - Thread chicken and spring onion pieces alternately onto soaked skewers, ensuring even distribution for uniform cooking.
03 - Preheat a grill or grill pan over medium-high heat. Oil the grates lightly to prevent sticking.
04 - Grill the skewers for 3 minutes on each side, brushing with yakitori sauce after turning. Continue grilling, turning and basting, for another 6–8 minutes until cooked through and glossy.
05 - Serve immediately, drizzled with extra sauce if desired. Best enjoyed hot off the grill.