Natural tubular structure of bamboo with one closed end and wider mouth helps to fill the pre cooked rice and vegetable mix or per cooked rice and non vegin layers and steam. Steam is not escaped from any side but only through the open end of the bamboo , makes the dum cooking easier and less time consuming. Open end of the bamboo tube has to be closed with the lid to keep the steam flowing into the food to cook well. The coconut shell disc (part of the product) needs to be placed inside the closed end to avoid food particles getting stuck at the end of the bamboo steamer.