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Line chart: a model assuming even flow predicts espresso extraction yield falling steadily as the grind gets coarser, but the measured curve peaks at a slightly coarser setting and drops at very fine settings, where water channels through the puck. Recreated from Cameron et al., Matter (2020).

Grinding Espresso Finer Won’t Always Make It Stronger

For years the espresso rule was simple: grind finer for a stronger shot. A landmark study in Matter tested that and found the opposite past a point, because too fine and the water just channels straight through the puck. Here’s what the team found, how sure we can be about it, and what it means next time you pull a shot at home (for me: not that much, but it can save you costs potentially… and its really interesting!)

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