1. Preheat grill to medium heat and lightly oil grate.
2. In a small saucepan over medium low heat, combine the sauce ingredients. Stir often, until the sauce just starts to bubble.
3. Place the chicken on the grill and brush with the sauce, turning breasts every 7 to 10 minutes. Continue to brush the chicken every time you turn it, cooking for about 45 minutes. Remove chicken when internal temperature reaches 180°F.