The national dish of Germany, sauerbraten is a traditional pot roast, made with beef rump that's marinated for days in vinegar or red wine (or both), mixed with water, herbs and spices. It's then served with a rich, sweet-sour gravy. Many people think the meal dates back to the 9th century, when Charlemagne was King of the Franks, while others say that Julius Caesar was the inspiration behind the dish; it's believed that he sent amphoras filled with beef marinated in wine to the new Roman colony of Cologne.