I was told by a Nepalese acquaintance that it's not available. Seems unlikely.
1 Answers
Often finding exotic ingredients means determining which cultures use that ingredient, determining where there's a high concentration of immigrants from those regions, and checking for stores in that area.
In this particular case, we know that yak is a staple of Nepalese cuisine, and searching for Nepalese restaurants in New York City, we find a cluster of about 8 near the intersection of Roosevelt Ave & 74th St. There's a smaller cluster of three on Queens Blvd. between 39th Pl & 50th St.
... and just searching for 'nepalese groceries nyc' finds Himalayan Mini Mart, which is sort of between those two clusters (39th Ave & 64th St.) There was also an article on the growing 'Little Nepal' in Jackson Heights. Following a few leads in that article, I also found a Himalaya Bazaar closer to that larger cluster of restaurants.

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