Yes there is vegetarian schnitzel too. And I didn't came up with the name, Germans call it like that.
Celeriac is a root vegetable and it is relative of celery, but looks completely different. Raw celeriac is a little bit milder in taste than celery, and when cooked it becomes a bit sweet and nutty in taste. I really, really like it.
I don't like celery so I probably would not have given a chance to celeriac if it wasn't for my curiosity. That it was called schnitzel helped as well.
Celeriac schnitzel is coated with flour, eggs and breadcrumbs just like meat schnitzel. But it needs to be fried on low temperature as it takes some time until celeriac turns soft. I fried it in some olive oil.