There used to be quite the array of choices but Biergarten has gone severely downhill in the last year. There were green salads, tomato salad, spelt salad, cucumber salad, roasted veggies, roasted potatoes, etc. Breads and two types of buns as well. The salad list is shortened now as and there is usually only one 'safe' hot veg item.
Be aware that the soup is not vegetarian either.
I used to recommend Biergarten for veggies but hesitate to do so based on the disappearing menu items, and the reduced quality of the food/amount of time food is left out. I have had many servers tell me similar things about the declining quality. It is an expensive meal for poor quality, tired food, and a limited choice.
I would take it that the previous poster was intending to be humourous, but it is a serious subject.