Maurizio Marcocci of Service Sphere discusses the role of coffee group heads, common espresso machine parts that serve a huge purpose.
To pull the best shots possible, baristas need to learn everything they can about coffee extraction. From grind adjustment to water temperature, these factors can all influence the flavour of coffee in the cup. However, while trying to grasp these complex concepts, many baristas can skip over a key component of espresso extraction.
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