Mix remaining ingredients in a large plastic bag. Place artichokes in the bag and coat all sides of the artichokes.
For best flavor marinate in the mixture overnight in the refrigerator but should marinate at least one hour.
Drain artichokes. Place cut side down on a grill over a solid bed of medium coals or gas grill on medium. Grill until lightly browned on the cut side, 5 to 7 minutes. Turn artichokes over and drizzle some of the remaining marinade over the artichokes. Grill until petal tips are lightly charred, 3 to 4 minutes more.
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