Which is the oldest vegetarian restaurant in the world?

According to a news resport, there is a new entry in the Guinness Book of World Records, for the oldest vegetarian restaurant in the world, and that honour has gone to Hiltl, in Zurich.

I am delighted that my friends who own Hiltl have won this place in such an eminent league.

Now Hiltl may or may not actually be the oldest vegetarian restaurant in the world (it opened in 1898).

Probably many Indian restaurants may be older!

But can they prove it?

Only if they can prove it, can they displace Hiltl in the Guinness Book of Records!

So there is a challenge...