How to Make It
Soak the corn in a large bowl of water for 1 hour.
Light a grill. On a large plate, blend the butter with the lime juice and tarragon and season with salt and pepper. Spread the butter in a 1/3-inch-thick layer in the center of the plate. In a small bowl, mix the chile powder and cinnamon. Grill the corn over moderately high heat, turning often, until the husks are evenly charred all over, about 25 minutes.
Carefully peel back the corn husks but leave them attached to the cobs. Discard the corn silk and use the husks as a handle. Roll the corn in the softened butter, top with a thick layer of crumbled cheese and sprinkle with the chile powder mixture. Serve right away.