Preserved Egg, also known as century egg or hundred-year egg, is a traditional Chinese delicacy made by preserving duck, chicken, or quail eggs in a mixture of clay, ash, and quicklime. The preservation process can take several weeks, resulting in a dark green or black egg with a creamy yolk and a jelly-like white. This unique food is often served as a side dish or ingredient in various dishes, such as congee or salads. Its strong flavor and distinctive appearance make it a popular choice for adventurous eaters, while its nutritional value adds to its appeal.