what are steamers used for
A food steamer or steam cooker is a small kitchen appliance used to cook or prepare various foods with steam heat by means of holding the food in a sealed vessel that limits the escape of air or liquids below a preset pressure. This manner of cooking is called steaming.rchaeological excavations have uncovered pottery cooking vessels known as yan steamers; a yan composed of two vessel, a zeng with perforated floor surmounted on a pot or caldron with a tripod base and a top cover. The earliest yan steamer dating from about 5000 BC was unearthed in the Banpo site.