Hiltl

The world’s oldest vegetarian restaurant is not in India—but serves some fine Indian food - https://www.cntraveller.in/story/hiltl-world-oldest-vegetarian-restaurant-indian-food-zurich-switzerland/ - Hiltl, recognised as the world's longest running vegetarian restaurant, is a much loved Zurich institution with a strong Indian connection.

https://hiltl.ch/en/