About eggs: Iron, Century, Tea, and Salted!

Pidan with silken tofu and scallion

I recall being really surprised when the TV show Fear Factor had Century eggs as one of their "scary" foods that contestants were dared to eat, because I had been eating these delicious creamy eggs my whole life! I was even more surprised when Andrew Zimmerman (the man who ate afterbirth on TV) refused a salad made with these preserved eggs and chodofu! Like no other cuisine I have tried, Taiwanese food is really imaginative with eggs.
Here are some of my favorites:
Century eggs (皮蛋, pidan; aka hundred year old, thousand year old, millenium, and preserved egg) are made by preserving chicken, duck, or quail eggs in a mixture consisting of clay, ash, salt, quicklime, and rice hulls for a period of several weeks to several months.  During this curing process, an alkaline material breaks down in the egg producing a sulfur-like smell and turning the yolk into a dark green-gray color. The surrounding white part of the eggs becomes a jelly-like substance with a brown color. I like eating these with silken tofu, cilantro, soy sauce, and scallions or chopped up in congee with pickled mustard (Source: http://en.wikipedia.org/wiki/Century_egg).

Iron eggs

Salted duck egg

Iron eggs (鐵蛋) originate from the Tamsui district of Taiwan. They are made by cooking, and recooking red cooked eggs until they are dark, hard, and chewy. They are too hard for me to chew!  
Salted eggs (鹹蛋) are made by soaking duck or chicken eggs in brine for a long time, then covering them with a salted charcoal paste. The eggs becomes orange and gelatinous and the flavor is, well, very salty. I love making salted duck egg with bitter melon. We also have had them mixed into batter and fried with squid. Unfortunately, one salted egg yolk has 359 mg of cholesterol (the daily limit is 350 mg).  
Tea egg (茶葉蛋, or marble egg) is a common Chinese snack food, found easily at convenience stores, restaurants, night markets, and in kitchens across Taiwan. The eggs are boiled until hard, then the eggs are cracked and the recooked for several hours in a mixture of five-spice, soy sauce, and tea (with or without the leaves). 
Iron egg recipe Salted egg recipe Tea egg recipe Recipes using Century egg 

Tea eggs

Homeade salted egg and bitter melon