BridgePort's Mettle and Mash series of limited edition brews often features experimental recipes. In brewing terminology, "mash" is the mixture produced by soaking ground malt (and sometimes other fermentable ingredients) in hot water to form the wort. The process often takes place in a metal brewing vessel, but as the name of the rotating series suggests, the resulting brew may test one's "mettle." This keg cap is from the early 2014 batch, a saison ale infused with hibiscus flowers and ginger flavor.