How to Make It
Preheat a gas grill to low (250°F to 300°F) on 1 side, or push hot coals to 1 side of a charcoal grill. Arrange 1 1/2 cups mesquite wood or hardwood chips in a shallow, wide layer on a piece of aluminum foil; wrap foil loosely around chips to form a packet. Poke several holes in top of packet using tip of a knife. Set aside.
Working with 1 corn ear at a time, peel husks down and away from the ear; remove and discard silks. Pull husks together to form a ponytail-like handle; secure using kitchen twine.
Stir together butter, cilantro, jalapeño, salt, and black pepper in a small bowl. Spread about 1 tablespoon butter mixture over each corn ear to coat; set aside remaining butter mixture.
. Place wood chip packet on unoiled grill grates over the lit side of the grill (or the side with the coals). Close the grill; let grill stand until it starts to fill with smoke, about 15 minutes. Open grill, and place prepared corn on unoiled grates over the unlit side (or the side without the coals). Grill, covered, until corn is tender, 20 to 25 minutes, maintaining grill temperature between 250°F and 300°F (if grill gets too hot, open grill until temperature lowers as needed). Remove corn from grill; let stand 5 minutes. Brush or spread corn with remaining butter mixture.