Traditional filling for momo (Nepalese dumplings) (3)

I believe the answer is:

yak

(Other definitions for yak that I've seen before include "Gossip; ox" , "Tibetan beast; chatter" , "A Tibetan long-haired ox" , "Shaggy Tibetan ox" , "Idle talk" .)

I've seen this clue in The New York Times.

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