I believe you can consume beef in nepal there are few stake houses in ktm i know of in and around Thamel. I have been to one but never ordered to eat. I would go try this time for sure. The stake house is called Himalayan Stake House around Chettrapati and it has been there for past 20 years for sure. Eventhough killing a cow is not legal but eating is and never was forbidded.

I_A_N