Sour-mashing 12 gallons of work in a Blichmann 20G kettle. Heat-belts and temp controller to keep temp between 115 and 120F.

I brewed my first sour-mashed Berliner Weisse back in January this year on my dreaded double-brew day which involved doing a quick 30 minute boil and chill while trying to mash a Flanders Red. Patience grasshopper. I aged the first Berline Weisse, MomoSuppai on 10 pounds of frozen peaches resulting in a very nice, light, peachy beer. The only real criticism was that it needed more sour to it. The original had about 48 hours of time with a pure Lactobacillus culture at 120F degrees. In my notes, I said next I’d let it sour longer.

That time as come. In addition to the desire for more tartness, I also wanted more volume. The first 5 gallons went way too fast, so the only thing to do was to bump up the volume. The challenge was how to sour mash the larger volume. The sour mash process I follow has the mashed wort held at close to 120F for as many days as you like after pitching a pure culture of Lactobacillus. The pure culture helps ensure that many of the off-flavors that can come from other bacteria don’t make it into the beer versus the traditional method of pitching in uncrushed grain which carries tons of bacteria.

I picked up some additional heat belts which I’ve used before to ensure proper temp control for the sour mash and they worked very well… almost too well as this time around I ended up pushing the temp up to 130F, not on purpose. I ended up toss in two handfuls of some uncrushed grain just in case the higher temp killed of the lab lacto. The result after 5 days was an intensely sour wort, hitting 3.2 pH.

On the offical brewday, the wort was boiled for about 30 minutes with a tiny addition of cascade, chilled to pitching temp and that’s it. The next challenge for this beer was getting fermentation going. I originally pitched one package of S-05 dry yeast. I had seen in many places that dry-yeast packets tend to have significantly more yeast cells than liquid yeast. The yeast pitching rate calculator indicated that I needed just over 250 billion yeast for 12 gallons of 1.031 S.G wort. Surely one packet would be enough. After two days though there was no sign of fermentation.

While I wasn’t panicking, I was worried. Looking around, I saw some more discussion about making sure you pitched heavily in an acidic environment so I promptly pitched another 3 packets of dry-yeast. A day later, I was rewarded with a nice krausen on the surface.

Thin krausen forming after pitching 5 packets of S05 dry-yeast.

After a week of fermentation, the beer is down to 1.010 S.G, so a little more to go. After terminal gravity, I’ll split the batch and age on BlackBerry and Apricot puree to try out some new fruit flavors in the beer.

The recipe is just a scaled-up version of the original.