By Mark Tichenor, Beer Correspondent American beer fans are fortunate; the best and most famous craft brews are available from coast to coast. Still, it's a pleasure to find excellent beers brewed and served on a small scale, with a local ethic. Some of the finest are only available at a singular time and place. That's the case with McBane's Unfiltered Expo Pils, brewed as a collaboration between Joe McBane, owner of Rochester's Tap and Mallet gastropub, and Bruce Lish, brewer at Custom Brewcrafters of Honeoye Falls, New York. Brewed to coincide with the Tap and Mallet's recent Real Beer…