In a mixing bowl, whisk together the soy sauce, honey, rice vinegar, minced garlic, grated ginger, sesame oil, and red pepper flakes to create the marinade.
Place the chicken thighs in a resealable plastic bag or shallow dish. Pour the marinade over the chicken, ensuring it is well-coated. Seal the bag (or cover the dish) and refrigerate for at least 30 minutes, or up to 2 hours for more flavor.
Preheat your grill or a non-stick skillet over medium-high heat.
Remove the chicken from the marinade, reserving the marinade for later use.
Grill or sear chicken thighs for about 6-7 minutes on each side, or until they reach an internal temperature of 165°F (75°C) and are nicely caramelized.
In a small saucepan, bring the reserved marinade to a boil over medium heat. Allow it to simmer for 3-4 minutes until it thickens slightly.
Once the chicken is cooked, brush the thickened glaze over the chicken thighs and cook for an additional minute.
Remove the chicken from the heat and allow it to rest for a few minutes. Slice or serve whole.
Garnish with chopped green onions and a sprinkle of sesame seeds before serving.
Notes
Marinating the chicken for longer enhances the flavor.