Soak corn with the husks on in water for at least 5 hours.  We kept ours in a bucket in the river.  Place on a grill of hot coals and cook turning a few times for about 10 minutes.  Husks will char.  In the mean time stick a jalapeno on a stick or a skewer and stick in the fire until roasted but not too charred.  Chopp it up and mix it with butter and salt and serve on the grilled corn