01 - In a large bowl, combine soy sauce, sesame oil, rice vinegar, garlic, ginger, and black pepper. Add the chicken pieces and toss well to coat. Marinate for at least 15 minutes, or up to 2 hours in the refrigerator for deeper flavor penetration.
02 - If using bamboo skewers, soak them in water for at least 20 minutes to prevent burning during grilling.
03 - In a small bowl, whisk together mayonnaise, sweet chili sauce, Sriracha, honey, and lime juice until smooth and well combined. Set aside.
04 - Thread the marinated chicken pieces evenly onto the skewers, leaving a small gap between pieces for even cooking.
05 - Preheat a grill or grill pan over medium-high heat. Grill the skewers for 6 to 8 minutes per side, until the chicken is cooked through and nicely charred with an internal temperature of 165°F.
06 - Transfer skewers to a serving platter. Drizzle generously with Bang Bang sauce, then sprinkle with sesame seeds and sliced spring onions. Serve immediately with extra sauce on the side.