preserved duck egg
Rich in protein and minerals including calcium and phosphorus; contains iron and various B vitamins. The preservation process significantly increases sodium content and may alter bioavailability of certain nutrients compared to fresh eggs.
About
A preserved duck egg, also known as pídàn (皮蛋) in Mandarin Chinese or century egg, is a duck egg cured in a mixture of salt, ash, and alkaline compounds (traditionally quicklime) for several weeks to several months. This preservation method, which originated in China during the Ming Dynasty, transforms both the albumen and yolk through a chemical process that breaks down proteins and creates distinctive dark coloration and a characteristic ammonia-like aroma. The resulting product features a translucent, dark greenish-black or dark brown exterior, with a creamy, pale greenish-yellow yolk that develops a complex, pungent flavor profile combining savory, sulfurous, and umami notes. The texture becomes custard-like and slightly gelatinous, distinctly different from fresh eggs.
Modern preservation techniques may use different chemical bases, including potassium carbonate or sodium hydroxide, though the traditional method remains common in artisanal production.
Culinary Uses
Preserved duck eggs are eaten primarily across East and Southeast Asia, particularly in Chinese, Vietnamese, and Filipino cuisines. They are typically served as an appetizer or snack, often sliced and accompanied by pickled ginger and soy sauce, or as a component in rice congee (zhou). The eggs may be diced and mixed into fried rice, added to savory custard tarts, or incorporated into salads. They are also used as a garnish for rice bowls and in dim sum preparations. Due to their distinctive, acquired taste and pungent aroma, they are most appreciated by those familiar with the flavor profile and are often considered a delicacy. Preparation typically involves peeling away the hardened shell and serving the translucent egg with minimal additional cooking.