Balut

Balut is a fertilized duck egg, most often from Pateros mallard ducks, incubated for fourteen to twenty one days and then boiled or steamed and eaten warm from the shell, broth, yolk and partly developed embryo together, typically with salt, vinegar or a chili-garlic dip; chicken eggs are sometimes used as an alternative. It originated in the Philippines, introduced by Chinese traders in 1565, and remains a widely sold street food there, with similar versions eaten as a breakfast or street food in Vietnam and Cambodia.