Preheat the grill to medium heat. In a small bowl, whisk the honey, miso paste, sesame oil, and crushed red pepper together. Taste and salt if needed. *Some miso pastes are extremely salty. With mine, I added about 1 teaspoon of salt.
Place the chicken pieces on the hot grill. Brush the miso paste over the tops of the chicken pieces. Grill for 5 minutes, then flip and brush the remaining paste over the grilled chicken. Grill another 5 minutes until the chicken is cooked through. Serve warm.