Deliciously sweet with musky undertones and a soft, butter-like consistency, it is no wonder the papaya was reputably called the "fruit of the angels" by Christopher Columbus. Papaya's seeds are edible, although their peppery flavor is somewhat bitter. The fruit, as well as the other parts of the papaya tree, contain papain, an enzyme that helps digest proteins. This enzyme is especially concentrated in the fruit when it is unripe. Papain is extracted to make digestive enzyme dietary supplements and is also used as an ingredient in some chewing gums.