Why Your Espresso Tastes Sour (And How to Fix It)
Sour espresso means underextraction. Five common causes and how to fix each one — from grind size to water temperature to bean freshness.
Tested by Brewers · Updated 2026
Independent, hands-on reviews of fermenters, kettles, mash tuns, hydrometers, and the malts and hops we actually brew with — tested batch after batch in our garage, not on a spec sheet.
The Bench, by the numbers
As of Q2 · 2026
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