Auerbach's Keller is probably a place you have to visit if you are in Leipzig. But it is not a place to go if you are vegetarian or vegan.
At least 95% of the dishes include meat, even on some simple dishes like salad and soups they put meat in. There is no real choice for veggies and I did not enjoy staying there.
In addition, prices comparably high, quality and general food experience is just average, if at all.
Other places are far more interesting for veggies to go.
Cons: loud atmosphere , not veg friendly, average food, high price