Anyone remember the Reinheitsgebot? Also known as the Beer Purity Law of 1516, it was developed in Bavaria and limited brewers to the use of malted barley, hops and water. (Yeast was excluded because it wasn’t yet understood and other malted grains, particularly wheat, were added later.) It was, for its time, a pretty big deal. It was a big deal in the early days of Canadian ‘microbrewing,’ too, with breweries from Granville Island to Upper Canada touting the Reinheitsgebot purity of their beers.