Raspberry vinegar provides a fruity, lightly tart note in the marinade for this dish.
Combine first 6 ingredients in a large zip-top plastic bag. Add hens to bag; seal and marinate in refrigerator overnight, turning occasionally. Remove hens from bag; discard marinade.
Place hens on a grill rack coated with cooking spray, and grill for 10 minutes on each side or until a thermometer registers 180°.
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