A balut is a fertilized duck (or chicken) egg with a nearly-developed embryo inside that is boiled and eaten in the shell. Popularly believed to be an aphrodisiac and considered a high-protein, hearty snack, balut are mostly sold by street vendors in the regions where they are available. It is commonly sold as streetfood in the Philippines. They are common, everyday food in some other countries in Southeast Asia, such as in Laos, Cambodia, and Vietnam. They are often served with beer.