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https://angelscup.com/blog/taste/coffee-extraction-sour-vs-bitter/
Is your portafilter already full? How many g of coffee in it?
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Up your dose and/or brew at a high temp (if your machine allows)
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When you say sour do you mean it's running through the machine too fast I.e. underextracted?
hippy
birofunk
Bainbridge
@Nef
Espresso heads - if my shot is coming out sour, but I don't think my machine can handle the grind being any finer - where do I go from there?