In a mixing bowl, combine gochujang, honey, soy sauce, sesame oil, minced garlic, grated ginger, rice vinegar, and black pepper. Mix well until you have a smooth marinade.
Place the chicken thighs in a large resealable plastic bag or bowl. Pour the marinade over the chicken, ensuring each piece is coated well. Seal the bag or cover the bowl and refrigerate for at least 30 minutes (or overnight for more flavor).
Heat vegetable oil in a large skillet over medium-high heat. Remove the chicken from the marinade, allowing the excess to drip off, and place the chicken in the skillet.
Sear the chicken for about 5-7 minutes on each side until cooked through and nicely caramelized. Use a meat thermometer to ensure the internal temperature reaches 165°F (75°C).
Once the chicken is cooked, pour any remaining marinade into the skillet. Cook for an additional 2-3 minutes, allowing the sauce to thicken and coat the chicken.
Remove the skillet from heat and let the chicken rest for a few minutes before slicing or serving whole.
Sprinkle sesame seeds and sliced green onions on top for garnish.
Notes
Serve with steamed rice or lettuce leaves for a complete meal.