01 - In a large bowl, whisk together gochujang, soy sauce, sesame oil, honey, rice vinegar, minced garlic, grated ginger, brown sugar, and black pepper until smooth and fully combined.
02 - Add chicken pieces to the bowl, tossing thoroughly to coat every piece evenly. Cover and refrigerate for at least 15 minutes, or up to 2 hours for deeper flavor penetration.
03 - Heat a large skillet or grill pan over medium-high heat until properly heated through.
04 - Shake excess marinade from chicken pieces and arrange in a single layer in the hot pan. Cook for 5-7 minutes per side, turning occasionally, until chicken is cooked through and develops caramelized edges.
05 - Pour remaining marinade into the pan, reduce heat to medium, and simmer for 2-3 minutes while stirring until sauce thickens and coats the chicken pieces evenly.
06 - Transfer glazed chicken to a serving platter. Sprinkle with sliced green onions and sesame seeds. Serve immediately with steamed rice.