Step Three: Keep turning those ears. Grill the corn, turning often, until the first layer of husk is completely charred. Depending on your fire, this could take from around 5 to 10 minutes. You can push the corn to a cooler spot if you're grilling other things for your meal, or transfer the grilled corn to a platter and keep it warm in the charred husks until serving.
Step Four: A final turn with the husks off. Just before serving, I sometimes peel back the husk and brown the kernels on the grill, turning the corn frequently. You don't need to oil the corn for grilling directly like this, as it only takes a minute or so for it to develop a roasty color and a little additional smoke flavor. But if the corn spends too long on the grill without the protection of the husk, the kernels will become dry and a bit chewy.
To remove the corn from its husk, cut the stem end up to the bottom of the ear and peel back the husks and silk. You might need to brush away burnt silks. Now just dress the corn as you like: butter, olive oil, salt. I suggest my Lime-Cayenne Butter.