Welcome to the Steemit Community. I'm vegan as well. I actually traveled to Germany a year ago. I flew into Frankfurt and stayed in Mainz. I took a bus to this fabulous restaurant but I actually forgot the name of it. Maybe you can help me out. All I can say is that the restaurant was centered around a German wall that had something to do with one of the world wars. There was a garden on the outside and a tower. You can walk around the garden before or after a meal. To get to the restaurant I had to take about a 30 minute bus ride from the Atrium Hotel in Mainze. i was dropped of downtown and then I walk and came upon a up stone stair well to which I walked a little further and came upon a grand entrance that looked more like a hotel. They had a 5 course vegan meal and to this day I can honestly say that I was the best vegan experience I ever had. I know it's a hot in the dark but maybe you are familiar. At any rate good luck you to and I wish you the best.