Regensburg, Germany, to be exact. At The Historic Sausage Kitchen by the river, or "Wurstkuchl." We knew on our Danube cruise that we needed to try the mini sausage sandwich here, to compare it to the one in Nuremberg, our next stop. Apparently there's a long-standing friendly rival on which sausage is better. I couldn't quite figure out if that was just a tour guide thing or actually true. Nonetheless, we went to Wurstkuchl and tried a mini sausage sandwich, with sauerkraut and mustard. It tasted like Germany in one fantastic bite-sized sandwich. What made it so good was the mustard. And they sell small jars for ONE EURO each. I stocked up on these great gifts and had a great time exploring Regensburg on a gray, overcast day.