What is the process behind the unique flavor of Vietnamese coffee made from beans that have been passed through the digestive system of a cat, known as cat poop coffee?

The unique flavor of Vietnamese cat poop coffee comes from the beans passing through the digestive system of a civet cat. During this process, enzymes in the cat's stomach break down proteins in the beans, altering their flavor profile. The beans are then collected, cleaned, roasted, and brewed to create a coffee with a distinctive taste.