Kopi luwak is a very expensive type of coffee. It is also known as civet coffee and is made from coffee beans that have been eaten and excreted by a civet, which is a small Asian palm civet. The beans are collected from the feces of the civet and are extensively washed and processed to create a unique and expensive coffee. The digestive enzymes of the civet are said to break down the proteins in the coffee beans, which alters their flavor and aroma. This results in a very smooth and low-acid coffee with a unique flavor profile. Due to the rarity and labor-intensive process of producing Kopi luwak, it is one of the most expensive coffees in the world.