Bigley Sour is a Kettle Soured Beer, which means during the brewing process we cool the wort (pre-beer) down and add a bacteria strain called Lactobacillus. That bacteria creates the sour flavors in the final product. After a couple days of souring, we will bring the wort up to a boil to kill off any remaining lactobacillus bacteria to prevent it from continuing to sour. We then proceed with the brewing as normal.