Whereas craftbrewers in the USA may be more apt to experiment during the brewing process (Sam of Dogfish Head especially comes to mind with his ApriHop & alles), some of the Bavarian Braumeisters have truly perfected age old recipes using only the bare essentials. Bare essentials = Reinheitsgebot, which is a Purity Law from 1516 stating that beer can only be made with hops, malt, yeast and water. How do you know when a beer adheres to Reinheitsgebot? It's sort of like when someone is vegan... Don't worry, they'll tell you. The epitome of Reinheitsgebot is the taste of a fresh Augustiner Helles - fresh necessitates vom fass in Munich and what better way to capture freshness than by going to the source...