Step 1

Combine all marinade ingredients in extra-large plastic resealable food bag; add turkey breast. Tightly seal bag; turn bag several times to coat turkey well. Place bag into 13x9-inch pan. Refrigerate, turning bag occasionally, at least 3 hours.

Step 2

Heat one side of gas grill on medium or charcoal grill until coals are ash white. Place coals to one side in charcoal grill. Make aluminum foil drip pan; place opposite coals.

Step 3

Remove turkey breast from marinade. Place marinade in 1-quart saucepan. Cook over medium-high heat until marinade comes to a boil; boil 1 minute.

Step 4

Place turkey breast onto grill over drip pan. Cover; grill, turning and basting occasionally with marinade, 2-2 1/2 hours or until internal temperature reaches 165°F and turkey is no longer pink. Discard remaining marinade.

Step 5

Place turkey breast onto platter; garnish with roasted garlic and rosemary sprigs, if desired.