Century egg (pi-dan) - Century egg (English spelling) pi-dan

Japanese: ピータン(皮蛋) - ピータン（英語表記）pi-dan

A typical Chinese dish, this is a type of processed egg. Duck eggs are mainly used, although chicken eggs can also be used instead. The eggs are soaked in a strong alkaline solution containing salt or a paste-like mixture containing these, sealed, and stored in a cool place for several months. During this time, the salt and alkali penetrate the eggs, causing the egg white to solidify into a reddish-brown gelatinous state, and the yolk hardens to a green-black color around the edges and turns yellowish-brown in the center, giving it a unique flavor. This flavor is caused by the breakdown of protein, and the egg also contains a fair amount of ammonia.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

代表的な中国料理の一つで，加工卵の一種。主としてあひるの卵を用い，鶏卵も代用される。食塩を含む強いアルカリ溶液あるいはこれらを含むペースト状混合物に卵を漬けて密封し，冷所に数ヵ月貯蔵する。この間に食塩とアルカリが卵の中に浸透し，卵白が赤褐色のゼラチン状に凝固し，卵黄は周辺が緑黒色に硬化し，中央部は黄褐色に変化して独特の風味をもってくる。この風味は蛋白質の分解によって生じたもので，アンモニアもかなり多く含まれる。

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