The beer zealot needs no explanation for cask ale, but for those unfamiliar with the naturally carbonated, unfiltered suds pumped through the special pull-down tap systems that you see at places like Max's, Wharf Rat, Liam Flynn's, and Bertha's, you're missing out. The serving style-sometimes through a special draft system, sometimes through a gravity pour (when a cask sits on top of the bar)-hails from England but is increasingly popular in Baltimore's bars. The method particularly suits the Halethorpe brewery's omnipresent Loose Cannon. The format softens the body and the hoppiness of the IPA, resulting in a creamy texture and a superbly balanced hop-malt character. Plus, Heavy Seas reportedly produces the most cask ale in the country.