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A century egg is a preserved Chinese egg, usually a duck egg. During curing, the clear white turns into a firm, dark, translucent jelly, and the yolk goes creamy and dark green-gray. Despite the English name, it is not a hundred years old. Most century eggs cure for a few weeks to a few months.
I still remember the first one I saw as a child. The dark, almost see-through white looked like nothing else on the table. It tasted far less alarming than it looked. I have seen the same reaction to Chinese chicken feet: the appearance causes more hesitation than the actual flavor, although the two foods taste completely different. Duck blood soup plays a similar trick: the name sounds alarming, while the cooked ingredient itself is mild and soft.
What Is a Century Egg?
The usual name is pídàn (皮蛋), often translated literally as skin egg or leather egg. You may also hear sōnghuā dàn (松花蛋), pine-flower egg, for the pale, branch-like crystal patterns that sometimes form in the white. In English, century egg, hundred-year egg, thousand-year egg, and millennium egg all refer to the same food. Preserved egg is also used, though that term can cover other preserved eggs too. Duck eggs are the most common, but chicken and quail eggs are cured this way as well.
What Does a Century Egg Taste Like?
The yolk is usually the most intense part: rich, creamy, salty, and deeply savory, with an earthy, faintly sulfurous edge. The white is firmer and milder, mostly there for its smooth, jelly-like texture. A light ammonia or sulfur smell can be normal, part of the chemical changes during curing.
Blue cheese is the common comparison, and it is fair. Both are rich, pungent, and hard to judge by looks. Even so, a century egg does not taste like cheese, and it does not taste like a boiled egg.
Century eggs were never something I ate often as a child, but if one appeared on the family table, I would usually try a little. I was always more interested in the translucent white than the yolk — I liked its firm, jelly-like texture. I rarely ate it on its own; I usually had a few pieces with plain rice, which softened the stronger flavor. The yolk felt too rich for me, so I often left most of it behind. These days, I hardly ever eat century eggs.
How Do You Make a Century Egg?
Century eggs are made by curing raw eggs in a strongly alkaline environment. Traditional methods coat the eggs in a mixture that may include clay or mud, wood ash, salt, quicklime, rice hulls, and sometimes tea. Modern producers may use a carefully controlled alkaline solution instead.
The alkaline ingredients change the structure of the egg’s proteins. The white sets into a dark, translucent gel without boiling, while the yolk becomes creamy and develops its distinctive color and flavor.
How Long Does It Take to Make a Century Egg?
Most century eggs take several weeks to a few months to cure, depending on the ingredients and production method. Despite the name, they are not stored for one hundred years.
Are Century Eggs Made With Horse Urine?
No. Century eggs are not made with horse urine. The myth may have developed because they can have a faint ammonia-like smell, which forms as the egg changes during alkaline curing.
Traditional methods use alkaline ingredients such as lime, wood ash, clay, and salt, while modern producers commonly use controlled alkaline solutions. No urine is involved.
Is Century Egg Healthy and Safe to Eat?
Century egg is still an egg, so it provides protein and fat, but it is not necessarily healthier than a fresh egg. The curing process also makes it fairly high in sodium, which is one reason it is normally eaten in small portions with rice, tofu, or congee rather than several eggs at once.
Some older production methods used lead compounds during curing. Modern commercial producers use lead-free processing, and products sold through regulated channels must meet applicable food-safety limits. Lead-free means lead compounds are not intentionally used in the curing process; it does not necessarily mean lab testing would find absolutely no trace. Choose sealed century eggs from a reputable producer.
How to Eat a Century Egg
A century egg is rarely the main event. Its strong, rich flavor works best against plain or fresh ingredients, and a few pairings show it at its best.
Century egg and pork congee: pídàn shòuròu zhōu (皮蛋瘦肉粥) folds chopped century egg and shredded pork into plain rice porridge. The mild congee softens the saltiness and the sulfurous edge, which makes it one of the easiest ways to meet a century egg for the first time.
Century egg with tofu: pídàn dòufu (皮蛋豆腐) is chilled silken tofu topped with chopped century egg, soy sauce, sesame oil, and scallions. The tofu is cool and plain, the egg brings the richness. It is a common cold starter in warm weather.
Remove the shell, rinse the egg briefly if needed, and slice it while cold.
What Is Century Egg Salad?
Century egg salad usually refers to liángbàn pídàn (凉拌皮蛋), a cold Chinese dish rather than a mayonnaise-based egg salad. The eggs are cut into wedges and dressed with ingredients such as soy sauce, vinegar, sesame oil, garlic, chili, ginger, or cilantro. Some versions also add chilled tofu or roasted peppers.
Do You Need to Cook a Century Egg?
No. Packaged century eggs are ready to eat once the shell is removed. They can be served cold, added directly to tofu, or stirred into congee near the end of cooking.
Where to Buy Century Eggs
Asian supermarkets usually carry them in boxes, plastic packs, or individual wrappers, with duck eggs the easiest to find. They are generally inexpensive, since this began as a way to preserve eggs rather than as a luxury food. If you do not have an Asian market nearby, Asian Taste Preserved Duck Eggs are also available online, including through Amazon. I have not personally tried this exact pack, so check the latest reviews, seller details, and storage instructions before ordering. Some products are shelf-stable until opened and others are not, so follow the storage notes on the package. Once an egg is peeled or cut, refrigerate the rest and use it according to the label.
Is a Century Egg Rotten?
No. The dark color, creamy yolk, and unusual smell come from controlled alkaline curing, not from spoiling. That said, preservation does not make any food indestructible. Skip any egg from damaged, leaking, or swollen packaging, or one that is past the date printed on the package.
A century egg makes more sense once you stop expecting it to behave like a boiled egg. For an easy first taste, try a few pieces in a warm bowl of congee, where the plain porridge balances its richer flavor.
If this answered a question you have always had about century eggs, share it with someone who still thinks they are one hundred years old.
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