Prepare the corn on the cob as you would normally do. Roast/steam in a warmer-roaster oven with about 1 inch of water in the bottom. After the water is hot, turn down to medium (180 -200 deg). These should be done in about 45 min. ... You can cook these at home and transport in the warmer and hold hot until ready to serve.
The last time I did this with 4 dozen ears of corn, I think they were ready in less than an hour. But, I had plenty of time and held the corn for about another hour before serving. So I'm not 100% certain of the cooking time. The corn was perfect. The electric roaster was perfect for starting and forgetting until ready to serve.
OH .... In case you don't have a roaster. You only need a 2 to 4 of inches of water in the bottom of the pot and a lid. The water should boil & steam in a few minutes, faster than a full pot, and the corn should cook in less than an hour. Add water if needed and adjust heat to a slow boil. Don't steam out all the water. The difference here, is that you can burn the corn on the bottom if the pot steams dry.
post edited by edwmax - 2012/07/19 11:34:55