Soak husked corn in water for 30 minutes, making sure they are completely covered with water, weigh down with plate.
Preheat BBQ to medium high, about 375°F.
Remove corn from the water, shaking off all excess water. Place directly on grill, turning occasionally, until outside layers of husk are charred and corn is steamed through. Check if ready by pulling down a little of the husk. Corn will take about 10 minutes.
Serve in the husk, peel at the table and glaze with butter and season with salt and pepper to taste.