Prepare the marinade by combining sesame oil, soy sauce, honey, minced garlic, grated ginger, and rice vinegar in a bowl.

Place the chicken breasts in a resealable plastic bag or a shallow dish and pour the marinade over them. Seal the bag or cover the dish, allowing the marinade to coat the chicken completely.

Preheat your grill to medium-high heat. Ensure the grates are clean and lightly oiled to prevent sticking.

Remove the chicken from the marinade, allowing any excess to drip off, then sprinkle with sesame seeds to coat.

Place the chicken breasts on the grill and cook for about 6-7 minutes per side, or until the internal temperature reaches 165°F (75°C).

Remove the chicken from the grill and let it rest for about 5 minutes before slicing.

Slice the chicken and serve hot, garnished with chopped green onions.