Fundamentals of Espresso
**Extraction = Amount of coffee material that dissolves into water during brewing. Factors that affect extraction are: Grind Size, Brew Time, Water Volume Used, Temperature, Pressure, Humidity In this short guide we'll discuss how to achieve the right extraction with espresso brewing. Finding the sweet-spot where the espresso is most balanced, needs the above mentioned factors to be understood. Espresso machines push water at boiling point - 97°C, through a puck of coffee at 9 bars of pressure. This equates to a huge...