1. Slice lamb lengthwise, cutting to, but not through, other side. Open the halves, laying lamb flat. Slice each half lengthwise, cutting to, but not through, other side; open flat.
2. Combine wine and next 5 ingredients in a large heavy-duty zip-top plastic bag. Add lamb to bag; seal. Marinate in refrigerator 8 hours, turning bag occasionally.
3. Prepare grill.
4. Remove lamb from bag, reserving marinade. Place reserved marinade in a small saucepan; bring to a boil. Boil 1 minute.
5. Place lamb on grill rack coated with cooking spray; cover and grill 20 minutes or until a meat thermometer registers 145° (medium-rare) or to desired degree of doneness, turning and basting lamb once with reserved marinade. Let stand 10 minutes before slicing.
carbo rating: 1