The most expensive and some say best coffee is Kopi luwak, made from the pits (coffee beans) of partially digested coffee cherries eaten then defecated by Asian palm civets. The coffee beans are fermented in a civet's intestines, creating the unique flavor of cat-shit coffee.
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@BillMorrisLCARS24 I've had it. It was unremarkable, I can't even remember if I liked it or not, but that indifference itself is a fair indication of my experience.