What is the definition of brew ratio in espresso preparation?

Brew ratio is a critical concept in espresso preparation that refers to the relationship between the amount of coffee used (the dose) and the amount of espresso produced (the yield). It is expressed as a ratio of yield to dose, which helps baristas calibrate how strong or weak an espresso shot will be based on the proportions of coffee and water. This ratio is fundamental in achieving the desired flavor profile, extraction efficiency, and consistency in the espresso brewing process.

Understanding this ratio allows baristas to manipulate the strength and taste of espresso by adjusting either the dose of coffee or the volume of water used, providing a systematic approach to recipe development and experimentation in espresso brewing.