Question

the coffee (taste) bitter


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Answer 1

Grinding coffee beans changes how the flavor compounds dissolve, which means that if it's too coarsely ground you risk under-extraction, and in turn a flat or perhaps a sour tasting coffee. But if they're too finely ground, you risk an over-extracted, bitter coffee

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Answer 2

coffee is often associated with bitterness. While bitterness can play a role in a good cup of coffee, if you drink a really good cup, you'll find that that bitterness is far from the dominant taste.