The document discusses the cooking technique of dum pukht, or dum cooking. Dum cooking involves slowly cooking ingredients in a sealed vessel so flavors are infused. It is commonly used for biryanis and other Indian dishes. The ancient practice of dum cooking originated from Persian or Central Asian cuisine and became popular in Mughlai cuisine. It allows food to cook in its own steam and juices. Examples given include chicken dum biryani and Kashmiri dum aloo.