Describe the sourness before trying to remove it
Some coffees have a bright, fruit-like acidity that is part of their appeal. Others taste sharply sour, thin or abruptly unfinished. Your preference matters, and the word sour alone does not identify a brewing fault. Consider whether the acidity sits alongside sweetness and a pleasant finish, or dominates everything else.
Taste the coffee at more than one comfortable drinking temperature. Note what changes as it cools, and avoid making a recipe decision from a sip that is too hot to assess clearly. If a bag is unfamiliar, ask the roaster what sort of profile it is intended to have.
Return to a recipe you can reproduce
Record the dry dose, brew-water weight, grind, temperature and preparation steps. A cup made with guessed amounts gives you several possible explanations at once. Starting from one measured recipe makes it easier to see whether the coffee needs a different grind or whether you simply prefer a different style.
A sharply sour cup with little sweetness can be a reason to investigate insufficient or uneven extraction. It is not proof that the whole brew was uniformly under-extracted. Different particles and parts of a coffee bed can extract differently, even within one drink.
Choose the most plausible adjustment
For a pour-over that runs much faster than your usual recipe and tastes sharp and incomplete, test a small move finer while keeping the amounts and pouring routine steady. If your water has been standing for a long time before brewing, first make its starting temperature more repeatable.
If the brew is already draining very slowly, do not keep grinding finer merely because it tastes sour. Look for uneven wetting, a change of filter or an erratic pour. A slow brew can still be uneven, and a clogged filter is a poor place to chase a textbook finishing time.
| Clue | Test next |
|---|---|
| Fast flow, little sweetness, sharp finish | A small grind adjustment finer at the same ratio |
| Inconsistent kettle waiting time | A repeatable water-temperature routine |
| Slow flow with sharp and drying flavors | Wetting, filter and pouring consistency |
| Balanced but brighter than you enjoy | Another roast or flavor profile |
Separate intensity from flavor balance
Using more coffee can make a sour drink more intense without making it more balanced. Likewise, adding water after brewing reduces concentration, but does not extract anything further from the grounds. It may make a drink easier to taste, yet it is a different intervention from changing extraction.
Keep a note of the direction of change. More sweetness and a longer pleasant finish are useful observations; a longer brew time on its own is not the goal. Once you find a good cup, save its settings as a practical reference for that coffee and setup.
Know when to change the coffee
If measured, repeatable brews remain brighter than you like, try a bag described with a less fruit-forward profile. You do not need to force yourself to enjoy every coffee. A conversation about roast style and flavor preferences may solve the problem more directly than another series of grind changes.