Mix all ingredients together except chicken breasts, stirring well. Reserve 1/4 to 1/2 cup for sauce.
Pour remaining sauce over chicken breasts as marinade. Marinate at least 15 minutes or for several hours.
Heat grill or broiler to medium/high heat, 400°F. If broiling, line broiler pan with heavy duty aluminum foil as excess sauce will burn easily.
Cook for 5 to 10 minutes per side to internal temperature of 165°. If desired, baste with marinade while grilling or broiling.
To serve place cooked chicken on plate, drizzle with reserved sauce. For extra juiciness, slice chicken breasts before drizzling with sauce.
*Tip: To make apple cider concentrate simply simmer 1 quart apple cider down to 3/4 cup.