Brettanomyces fermented IPA The exploration of yeast strains and the different results we can achieve are beautifully exemplified in Evolver a pale ale with a difference. 100% fermented with Brettanomyces. For the first 3 months the beer tastes the same as a fresh pale ale then the differing flavour compounds start to shine through and after 6 months the Brett really takes hold. The brettanomyces yeast is particularly good at keeping hop flavours fresh for far longer than traditional brewing yeasts. The Evolver takes on a more complex character over time as the yeast and the hops combine to produce a new and exciting beer that will continue to evolve as the yeast slowly matures the beer. This is a beer that can be drunk fresh as a normal pale ale or left to evolve and mature into a unique and unusual beer.