Coffee quality depends on a combination of factors. Fresh beans, measured by both how long it's been since the beans were roasted and the time elapsed since grinding the beans, are imperative. High quality beans (measured by the specific crop, processing, handling, etc.) are, obviously, desirable, but the highest quality beans are all but useless if stale. Clean good-tasting water must be used, and the coffee must be brewed with clean equipment at the proper temperature for the proper amount of time.
Simply buying top-quality beans is no guarantee of great coffee; if those beans are stale, the water quality poor, the brewing temperature low, or your equipment dirty, you will have wasted money on those expensive beans. Lesser quality yet freshly roasted beans, ground before use, will almost certainly be superior to a higher quality sample that is stale. Copied Scott Rothstein
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