1 cup hickory or mesquite chips soaked in water for 1 hour for a charcoal grill, or 1/2 cup dry wood chips in a smoker box or an aluminum foil packet poked with holes for a gas grill
1 tablespoon balsamic vinegar
1/2 teaspoon salt
2 canned chipotle chiles in adobo sauce, very finely chopped
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