• LOCATION 7 | Cellar Audio Guide: From Berry to Barrel to Bottle

    7. Yeast: The Second Act

    7. Yeast: The Second Act on Cape Town audio tour Cellar Audio Guide: From Berry to Barrel to Bottle

    NARRATOR: There’s a container on this sign with yellow granules in it. Lean over and give it a sniff.

    [2 second pause]

    Does it smell familiar? It you’ve eaten Marmite, it probably does. That’s yeast, the uncelebrated fungus that turns the wheels of fermentation by making alcohol out of sugar.

    Once the juice or mash is in the fermentation tanks, Boela adds minute quantities of yeast. As soon as it comes into contact with the sugars in the juice or mash, it starts to consume them. As it does, it creates alcohol, CO2, and more yeast. The new yeast consumes more sugar, creating more alcohol, CO2, and more yeast, which consumes more sugar… You probably get the picture.

    The process only ends once all the sugar has been consumed, and the yeast becomes dormant. But if more sugar is introduced, the whole cycle starts up again.

    This is a critical part of the process for Boela, and he does a chemical and micro analysis every day, to make sure that nothing goes wrong.

    Let’s head over to the part of the cellar where all of this happens now. When you’re ready, walk onto the long walkway dividing the cellar. Our next location is number eight.

Cellar Audio Guide: From Berry to Barrel to Bottle