What is "century egg"?

Century egg, also known as preserved egg or thousand-year-old egg, is a Chinese delicacy that features eggs that have been preserved in a mixture of clay, ash, salt, and quicklime for several weeks to several months. The preservation process causes the egg white to turn a translucent, jelly-like texture, while the yolk takes on a creamy and solid consistency with a rich and pungent flavor. The eggs are typically served in slices and may be eaten on their own or used as a topping for congee or rice dishes. The distinctive flavor and texture of century eggs may be an acquired taste for some, but they are considered a delicacy in many parts of China.