Chhurpi is a hard, dried smoked cheese eaten in the Eastern Himalayas. The Sherpas call it sherkam. Chhurpi is made from the milk of a yak or chauri (a hybrid of yak and cattle). It is prepared in a local dairy or at home from a material extracted out of buttermilk called sergem . The sergem is wrapped in clothand pressed hard to get rid of water. Then, it dries out and becomes similar to cheese. Finally, in this cheese-like stage; it is cut into pieces, and hung over the smoke to make it stone hard.