How do I stop my coffee from tasting bitter?
Bitterness is usually over-extraction: grind coarser, brew for less time, or drop the water temperature toward 90-94°C. If it stays bitter across all three fixes, suspect a very dark roast or stale beans — both add bitterness that no recipe can remove.
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Work down the checklist in order of likelihood. First, grind: bitter compounds are the last thing water pulls from the grounds, so a coarser grind is the most effective single fix. Second, time: finish immersion brews sooner. Third, temperature: 90-94°C extracts less harsh material than boiling water and is worth trying with dark roasts.
If the recipe is right and the cup is still harsh, the beans are the cause. Very dark roasts carbonize sugars; stale beans turn papery-bitter as aromatics leave and oils oxidize. Buy fresher, lighter-roasted coffee and keep it sealed.
A trace of bitterness is not the enemy: it keeps a cup from tasting flat and sweet-only, which is why a little robusta survives in some traditional espresso blends.
- · Specialty Coffee Association — Coffee Standards: https://sca.coffee/research/coffee-standards