What does the term "parti-gyle" refer to?

The term "parti-gyle" refers to a brewing method that employs multiple runnings of a single grain bill to produce different beers, typically with varying strengths and styles. The process involves mashing the grains and then extracting the wort more than once, allowing the brewer to collect the first runnings, which are rich in sugars and ideal for a stronger beer, and subsequent runnings, which can be used to create lighter or lower-alcohol beers. This technique not only maximizes the efficiency of the grain bill but also allows for the creation of a range of flavors and styles from the same ingredients.

This method has historical significance, especially in traditional British brewing, where it was common in the production of both ales and milds. It underscores the brewer's ability to manage and innovate with available ingredients, showcasing both creativity and resourcefulness in brewing practices.