Add the soy sauce, brown sugar, water, mirin, sesame oil, rice vinegar, gochujang, ginger, garlic and pepper to a small saucepan. Bring the mixture to a simmer.
¾ cup low-sodium soy sauce, ¾ cup brown sugar, ¼ cup water, ¼ cup mirin, 2 tablespoons sesame oil, 1 tablespoon rice vinegar, 3 tablespoons gochujang, 1 tablespoon minced fresh ginger, 4 cloves garlic, ½ teaspoon ground black pepper
In a small bowl, stir the cornstarch and water together.
2 tablespoon cornstarch
Remove the pot from the heat, add the cornstarch slurry and whisk to combine. Return the sauce to a simmer and cook until thickened, about 1-2 minutes. Set aside to cool completely.
Place the chicken in a large bowl. Pour half the sauce over the chicken and toss to coat. Cover and marinate in the fridge for at least 2 hours and up to 8 hours. Reserve the remaining BBQ sauce for serving.
3 pounds bone-in, skin-on chicken thighs
Heat your grill, or grill pan, to medium-high heat. Place the chicken on the grill, skin side down. Cook for 10 minutes or until the skin is crisp.
Turn the chicken, lower the heat and continue to cook until the chicken is cooked through.
Remove from the grill, garnish with green onions, sesame seeds, and serve with the remaining BBQ sauce.
1 green onion, Sesame seeds