Vietnamese - medicinal Foods. Birds Nest Soup. The soup is made from edible bird nests which are called the “Caviar of the East”. Bird's Nest Soup is extremely rare and valuable. The main ingredient is the nest of the swiftlet bird which is usually found in Southeast Asia. Edible bird's nests are among the most expensive animal products consumed by humans. It is regarded as a delicacy, health booster, life prolonger and aphrodisiac in Asia, particularly in China and Hong Kong