Preheat the grill or a grill pan to medium-high heat
In a bowl, whisk together soy sauce, honey, rice vinegar, sesame oil, garlic, and ginger
Place the chicken breasts in the marinade and let sit for at least 15 minutes
Grill the chicken for about 6-7 minutes per side, or until fully cooked and juices run clear
Sprinkle with sesame seeds for garnish