Preheat the grill.
In a pot with water, add some salt and soak the ears of 10-15 minutes.
Put the cobs to cook on the grill, over indirect heat, for 5 minutes, turn them and cook for 5 more minutes.
Put the cobs over direct heat and cook for 2-3 minutes on each side. Do not be afraid if you char them a little: you’ll get a better, more complex flavor.
Spread the cob with butter and season with salt and pepper.