Delicately fold back the corn husk leaves and remove the silk, then fold the leaves back into place.
Immerse the corn in cold water for 20-30 minutes.
Set the grill to medium-high heat.
Place the corn on the grill. Rotate the corn 90° every 5 minutes during the cooking process, which should take approximately 20 minutes in total. Remove from the grill. Unroll the husk slightly and check the kernels to see if they are bright yellow. Remove the husk and slather the corn generously with butter. Season with salt and pepper.