|Alternative names||preserved egg, hundred-year egg, thousand-year egg, thousand-year-old egg, millennium egg, black egg, blacking egg, skin egg|
|Place of origin||China|
|Main ingredients||Egg preserved in clay, ash, salt, quicklime, and rice hulls|
|Variations||duck, chicken or quail eggs|
A century egg is a cured duck egg. They are made by putting the egg in a mix of clay, salt, quicklime, and ash. A century egg is not really 100 years old. People call it a century egg because it looks different and takes months to make. Century eggs can also be made from quail or chicken eggs.