I just adore this place. I actually didn't visit it when it opened as I expected it to be just pre-packed fast food warmed up. How wrong I was!
I visited today for the first time and was almost knocked off my seat by the heavenly burger! I've tried a few good gourmet veggie burgers, including those at the Hard Rock Cafe in London and Paris, but the bacon burger I has at Tom and Karo was the best I've ever had. I told them this and they explained that everything is hand-made, and that includes the veggie patty AND the veggie bacon (which was incredibly delicious). The prices are really reasonable for gourmet burgers so I shall be returning every time I'm in Bremen. Lovely staff as well incidentally, and the apple and chocolate cake for afters was great! They also have a dish of the day with lots of vegetables, so there's something for everyone! And all of it is vegan!
Cons: I wish I lived in Bremen!, nothing else