Place the Balsamic, honey, lemon juice, oregano, salt and pepper into a small bowl, mix well.
Place the chicken breasts in and thoroughly coat in the mixture and leave to marinate for 20 minutes.
Pre heat the grill to the hottest setting
Pop the chicken breasts onto a tray or dish then under the grill and grill for 5-6 minutes on each side.
Once cooked, remove and cover with foil and leave to rest for 15 minutes.