Yeast so often plays third fiddle in the conversation about beer, and how it’s made. It never quite shares the limelight with hops, the most glamorous beer ingredient, and to some extent malt. And yet, it’s one of the most fascinating elements within beer's makeup. In this episode we chat to Alix Blease of Lallemand, and dig into the importance of yeast in brewing.

There’s a saying some brewers like to peddle, not to mention Alix herself in this episode: “brewers make wort, yeast makes beer.” It’s a statement I’ve never been inclined to agree with, because—as we learn in this episode—there are so many factors that can implement the fermentation process, and it is brewers, or cellar managers as they’re typically referred to in a brewery, who control these various processes. 

Simple adjustments such as temperature, the size and shape of a particular fermentation vessel, and indeed the strain of yeast (or yeasts) itself will have wildly different influences on a particular beer's fermentation. Through the careful stewardship of their yeast, brewers can influence a variety of flavours and other characteristics that contribute hugely to the finished beer in your glass.

Maybe, then, I can agree in part that the yeast does make the beer, but it wouldn’t be able to do so without those who steward it. Perhaps, in terms of fermentation, it’s more useful to describe brewers as shepherds, or perhaps yeast wranglers, who give these little critters the best possible chance to make a beer you and I will enjoy. In this episode, we learn why all of this is so important, and talk about some interesting developments in the future of yeast science, and how this will influence modern beer production.

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