I haven't actually tried this myself, but it sounds like it just might work. This if from an E-Mail I received.
As an obsessive food nerd, you'd expect that I would have at least heard of it, but over the weekend I was blind-sided by the simple genius of this method for cooking loads of corn on the cob perfectly.
I was hepped to it while visiting my family in Maine. Short story: We like corn on the cob. And with eight adults at the table, that means a couple of dozen ears. We would have used the lobster pot to cook them all, but the lobster pot was busy steaming lobster.
Then my sister, a capable Maine cook with years of camping experience, says "let's do cooler corn!" Before I can ask "what the heck is cooler corn?" a Coleman cooler appears from the garage, is wiped clean, then filled with the shucked ears. Next, two kettles-full of boiling water are poured over the corn and the top closed.
When we sat down to dinner 30 minutes later and opened it, the corn was perfectly cooked. My mind was blown. And I'm told that the corn will remain at the perfect level of doneness for a couple of hours.