April 23 marks 501 years since the German Reinheitsgebot, a law that famously defines which ingredients are allowed in the brewing of beer, came into effect throughout Bavaria. That's as good an excuse as any to stop by either the Akasaka or Kanda outpost of casual Teutonic diner Schmatz, where patrons are treated to unlimited quantities of fine German brews from 11.30am onwards. And the best part? It's all completely free. Just make sure to head over early, as service stops as soon as they run out of beer.