In a small bowl, stir together honey, Sriracha sauce, soy sauce and garlic.
Make shallow cuts to both sides of the chicken.
Brush marinade over both sides of the chicken.
Place the chicken on the barbecue with the lid down. Turn and baste often with marinade for the first five minutes. Continue to barbecue until the chicken feels springy when pressed and a meat thermometer reaches 165°F, about 7 to 10 more minutes, depending on your barbecue.
Remove from barbecue to a serving plate and sprinkle on sesame seeds.