Leaving one section free of coals, on a charcoal grill, or leaving one burner off on a gas grill, heat a grill to medium (350°F).
Pat the chicken thighs very dry with paper towels.
Season both sides with the salt and pepper.
Coat with the peanut oil.
Place the chicken thighs on the hot grill, skin-side down, close the grill lid and cook, moving the chicken away from any flare-ups, for 5 to 8 minutes, or until the skin lifts easily from the grill grates.
Transfer a few tablespoons of the sauce to a small bowl; set aside.
Flip the chicken thighs and use a heat-resistant brush to coat with some of the remaining sauce.
Cover the grill again and cook for another 5 to 8 minutes; flip and baste with the sauce again.
Grill with the lid open for another 10 minutes or until the thighs reach an internal temperature of 165°F on an instant-read thermometer.
If the skin starts to burn, flip the chicken and move to the cool part of the grill.
Flip the chicken skin-side up, one last time, and rest on an upper rack or the cool side of the grill for 10 minutes; use a clean brush and the reserved sauce to baste once more.
Transfer the chicken to a platter; sprinkle the tops with the crushed coriander and serve.