What I do is take a stick of butter. Put it in a bowl and maybe 2 tbls of cayenne pepper. Mix it up real good. Then paste the butter and cayenne pepper on the corn real good. Then wrap it back up with the husk along with foil. Place on grill and cook for about 30 to 45 min on grill. I do mine in-direct heat. Like my corn on the cob nice a juice. If you have any of the butter left it even better. I alway add more to mine when I'm done cooking, even to my bake potatoe.
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