01 - In a large bowl, combine gochujang, soy sauce, sesame oil, honey, rice vinegar, garlic, ginger, brown sugar, and black pepper. Mix well to create a smooth, homogeneous marinade.
02 - Add chicken pieces to the bowl, tossing thoroughly to coat evenly. Cover and refrigerate for at least 15 minutes, up to 2 hours for deeper flavor penetration.
03 - Preheat a large skillet or grill pan over medium-high heat until properly heated.
04 - Add marinated chicken, shaking off excess marinade, to the pan in a single layer. Cook for 5–7 minutes per side, turning occasionally, until chicken is cooked through and caramelized at edges.
05 - Pour remaining marinade into the pan, reduce heat to medium, and simmer for 2–3 minutes until sauce thickens and evenly coats the chicken pieces.
06 - Transfer chicken to a serving plate. Garnish with sliced green onions and sesame seeds. Serve hot with steamed rice or sides of choice.