Last week, C. Clairborne Ray of the New York Times answered this question as part of the paper’s Q&A feature: bookofjoe: What makes coffee bitter?. (I’m citing it on another blogger’s post instead of the original NY Times source — in case you are religiously opposed to NYT logins.)
As the article states, coffee is a “complex chemical soup”. So complex, in fact, that the answer they offer is a complex alphabet soup.
The digestible short of it is that a little bitterness isn’t necessarily a bad thing for the overall balance of coffee, as it cuts down on its acidity. However, you can cut back on the perceived bitterness of the cup by avoiding distilled water, by brewing at higher temperatures, and laying off the robusta. The Coffee Research Institute also recommends medium roasts, drip-brewed systems, and using a coarser grind.
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