01 - In a large bowl, whisk together the gochujang, soy sauce, honey, rice vinegar, sesame oil, minced garlic, and grated ginger until smooth and well combined.
02 - Add the chicken pieces to the marinade and toss thoroughly to ensure even coating. Let rest for at least 10 minutes at room temperature, or refrigerate for up to 2 hours for more pronounced flavor.
03 - Heat a large skillet or grill pan over medium-high heat until a drop of water sizzles on contact.
04 - Arrange the marinated chicken pieces in the hot pan in a single layer. Cook for 6 to 8 minutes per side until the chicken is cooked through, caramelized, and reaches an internal temperature of 165°F.
05 - Remove the chicken from heat and transfer to a serving platter. Sprinkle with toasted sesame seeds and thinly sliced spring onion. Serve hot alongside steamed rice or vegetables.