With a long, rich history, Sour beer is more of a family of styles rather than one particular type. This family includes Belgian classics like Lambic, Gueuze and Flanders Red, as well as German beers such as Gose and Berliner Weisse. Each of these have their own unique characteristics and brewing processes, while sharing a wonderfully tart, potentially lip-puckering quality created by a combination of bacteria and wild yeast (Brettanomyces).
Traditionally Sour beers were created through a process of allowing wild yeasts to spontaneously ferment the beer though, these days, you’re likely to find them brewed in more controlled environments. Part of the current popularity of Sours is no doubt due to the way in which many brewers use fruity (whether that’s fresh fruit, juice, or purée) adjuncts to complement the tartness. Magic Rock’s Salty Kiss is a good example, a Gose that blends notes of salt, juicy berries with the sourness for a delightfully refreshing beer.