I boil them, starting with cold water. Shuck the corn, put it in slightly salted water, and turn the heat on. The corn is done in 20 minutes, normally just after the water comes to a boil.
It's easy and foolproof.
If I want to get fancy, open the husks, add some butter and pepper flakes, close em back up and put on the grill. They come out really nice that way, but for volume I just use a big pot on the stove.
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