All coffee guides · Troubleshooting
Some bitterness is normal in espresso. A harsh or drying finish can come from extraction, roast level, channeling or stale coffee. Use the taste and flow of the shot to narrow down the cause.
Coffee naturally contains bitter compounds, and darker roasting can increase perceived bitterness. A dry or harsh shot may also involve uneven extraction, an unsuitable recipe or stale residue. Do not assume every bitter cup is over-extracted or that bitterness appears only at the end of a shot.
If flow is otherwise reasonable, try stopping at a slightly lower yield while keeping dose and grind steady. If the shot is unusually slow or stalled, check basket capacity and try a small adjustment coarser. A long shot time by itself does not prove that the grind is wrong.
Roast style, freshness and storage affect flavour. If a carefully prepared coffee remains more bitter than you enjoy, try a different roast or coffee. There is no single peak-freshness window that fits every bean and roast; use the roaster’s guidance and compare taste.
Keep distribution and tamping consistent. Erratic flow or spraying may suggest a preparation problem, but these signs do not establish an exact cause. Avoid changing several variables in response to one shot.
Coffee oils and residue can add stale flavours. Check the basket, portafilter and accessible group parts, and clean them according to the manufacturer’s instructions. Use only compatible products. Cleaning cannot remove bitterness that comes from the coffee itself.
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