Vegan/Vegetarian Food at YAPC::Europe 2012 in Frankfurt
I created a page and listed some restaurants which are vegan/vegetarian or have vegan options:
If you ask for vegan options in a restaurant, don't be surprised if not everybody knows what it means - or worse, they think they know it but don't =)
Regarding that Germany still seems to be a developing country. When in doubt, ask explicitly for no dairy products (Milch, Sahne, Käse, Joghurt etc.).
If you are from Frankfurt and know more vegan restaurants or shops, please add them to the wiki page.