In a small bowl, combine the sauce ingredients.
In a medium bowl, add chicken thighs and 4 tablespoons sauce. Mix well. Let marinate for 30 minutes.
Preheat oven to 425℉.
Place chicken, skin side up, on a baking sheet and bake for 30 minutes.
Meanwhile, in a small saucepan on medium heat, add the sauce and ¼ cup water. Bring the sauce to a simmer.
In a small bowl, dissolve cornstarch in 1 tablespoon cool water to make a slurry. When the sauce is simmering, add the cornstarch slurry. Stir and cook until the sauce thickens.
Baste chicken with leftover marinade or some of the sauce and bake for another 10 minutes until the skin is crisp and the sauce starts to caramelize.
Remove the chicken onto a platter. Ladle the remaining sauce over the chicken and serve with rice and vegetables.