Q1: Why does this page use "momos" for the plural of "momo"?
A1: Because several reliable and well-edited sources inside and outside of Nepal have used "momos" for the plural, including The Kathmandu Post, the Times of India, and the New York Times. (Due to the Great Firewall, contributions from Tibet are lacking.) Some comments have cast this as an India vs. Nepal issue, but many Nepali sources are inconsistent in their use of "momo" or "momos", even within a single article. Information on why this issue is so contentious would be useful.
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