How do I use beer barm to make sourdough?
I have been making sourdough now for the last six months or so, fairly successfully, using a starter that I created on the bread-making course that kicked this all off.
While on the course, I mentioned to the instructor that I also brew beer and he said I could use the beer barm to make bread. However, I'm not sure exactly how to do that.
Barm is defined as
the foam or scum formed on the top of a fermenting liquid, such as beer[...]
Now, the first problem I have is that I do not have easy access to the top of my fermenting beer. In order to keep things sterile, the lid of our fermenter is kept firmly on until after bottling. I am therefore left with whatever we have left over after bottling. I have emptied this into a tub and the result is a lot of sediment at the bottom with fermented beer on top. I'm not even sure if this qualifies as "barm", although it must contain whatever was on the top of the liquid before we bottled.
This is a side view that shows the separation.
and here is some of the sediment scooped off the bottom.
Question: Can I use this to make a starter? If so, how? Which part do I use, and what do I do with it? I'm not even sure exactly what the sediment is.
And is there any part of it I shouldn't use, or can I just bung it together with some flour and see what happens next? :-) I'm more than happy to experiment, as long as it's safe!
Best Answer
What you've got there is a mix of precipitated proteins from the wort (the "trub") mixed with Saccharomyces cerevisiae spores, and also various compounds from the hops. It's on the bottom of the beer because you're making an ale; only lagers have the yeast floating on the top, and then only during active fermentation.
Taste a bit. Then drink something to get the awful taste out of your mouth. :-)
You can absolutely use those spores to start a sourdough starter. The hop compounds may slightly retard the growth of the bacteria which you want in a sourdough starter, but after a couple of feedings they'll be basically gone. If you're worried about that (or the taste) you can use a process called "yeast washing" to get most of the trub out of the yeast.
As for whether you should do this? I wouldn't bother. The ultra-pure strain of S. cerevisiae that's been selectively bred for beer fermentation is eventually going to be crowded out by some other, scrappier wild yeast. Honestly, the most successful sourdough cultures I've started have been made of flour, water, and kismet.
Historically, yeast cake from beer brewing has been used for baking bread directly (rather than through propagating a starter over time), because it was an easy way to get a large quantity of a pure strain of yeast. That is, it was used to make non-sourdough bread. Now we have packets of instant yeast, for beer and for bread. Since you're using the instant yeast for beer, I don't know why you wouldn't use (a different) instant yeast for bread.
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Quick Answer about "How do I use beer barm to make sourdough?"
Is barm a sourdough starter?
Sourdough barm for high hydration breads is the basic mother starter or 'chef' used by high hydration sourdough bakers. The hydration refers to the weight amount of water to flour in the dough.What is beer barm?
Barm is the foam or scum formed on the top of a fermenting liquid, such as beer, wine, or feedstock for spirits or industrial ethanol distillation. It is used to leaven bread, or set up fermentation in a new batch of liquor.Can I use beer to make sourdough starter?
Beer and Sourdough Starters A few people have asked whether it would be ok to add beer to their sourdough starter or even start a sourdough starter with beer instead of water. My advice is not to add beer to your sourdough starter. Just keep it to flour and water - and keep the beer for your actual sourdough bread.Can you make sourdough starter with beer instead of water?
It is actually possible to simply replace the water in your sourdough bread with beer, but you can also add other ingredients to create a whole new flavor profile. Using 20% won't sacrifice gluten development or oven spring, but you'll still get the flavor you want.Experiment Time: Sourdough BEER Bread | LIGHTEST to DARKEST | Foodgeek Baking
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Answer 2
Sneftel's answer is excellent.
These starter cultures just keep improving the more they are used, even over very long periods of time (epigenetics). All of the best ones I've tasted are ancient ones I bought off the internet. Eventually I've thrown them all away because the only one I ever want to use is the famous Ischia culture.
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