Extraction Yield (EY) in Dried Pucks and Espresso using Initial Coffee Moisture

Coffee Data Science

Diving deeper into dried pucks, refractometers, and ristretto shots

I bought a Decent Espresso Machine (DE for shot) a few months ago, and I was excited because I could stop the shot unlike a lever machine where the shot continues. A lever machine lacks a three-way valve to allow the pressure inside the puck to release. So I was able to dry some spent coffee pucks and compare extraction yield to measurements I took with a refractometer …

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