The world's most expensive coffee is Civet coffee (Kopi Luwak). It is unusual in that the coffee bean has to pass through the digestive system of Civet (an asian cat), which mellows the bean. | The world's most expensive coffee is Civet coffee (Kopi Luwak). It is unusual in that the coffee bean has to pass through the digestive system of Civet (an asian cat), which mellows the bean. |