Utrecht-based Brouwerij Maximus crafted the Wicked Crystal Kefir Sour Ale through an inventive kettle-souring process using a probiotic water kefir culture. A single 2000-litre base batch yielded multiple fruited variants, demonstrating the brewery's experimental approach. The beer's name refers to the kefir crystals central to its fermentation.

This light Berliner Weisse-style sour delivers a crisp, refreshing tartness with fruity notes of passion fruit and citrus. At just 3.9% ABV, it's a highly sessionable choice for warm weather. The beer presents a bright golden hue beneath a generous white head.