What unlikely ingredient makes sour beers so, well, sour?
Answer Bacteria
Remarkably, sour beers are made by introducing various yeast strains or bacteria (Lactobacillus, Brettanomyces, and Pediococcus being the most common) into the brew. The strains are typically added through the barrels or during the time where the wort is cooling.
Asked by Rachel Bortles · Last updated 5 years ago · 1.9K views · SOURCE
