Century eggs

A century egg is a delicacy that is usually produced in the south of Taiwan. It made by preserving duck or chicken eggs in a mixture of clay, ash, salt, quicklime, and rice hulls for several weeks to several months, depending on the method of processing. The egg ends up with the white that is jelly-like and amber-brown and the yolk is smoky-black. It has a strong flavor due to the hydrogen sulfide and ammonia present in it.