There's an ingredient in Chinese cuisine that produces more visual rejection in Westerners than any other. Not offal, not coagulated blood—the ingredient that most consistently makes people say "no, not that" is a dark greenish-black duck egg with translucent jelly that smells of ammonia. The century egg. The pidan (皮蛋). And it's a shame, because it's delicious.
First: it's not a hundred years old. The curing process takes between three weeks and three months depending on the method. The English name ("century egg") is hyperbole that helps no one. In Chinese it's called pidan (皮蛋), which simply means "skin egg."
It's a duck egg cured in an alkaline mixture. Traditionally, that mixture contained wood ash, clay, salt, and lime. In modern production, sodium hydroxide solutions are used. The alkalinity raises the egg's pH to 9-12 levels. At that pH, proteins denature in ways heat can't achieve. The white turns black or dark brown and acquires a gelled texture. The yolk turns greenish-gray and creamy. The egg develops a sulfurous aroma that's challenging at first.
The problem is that smell is the barrier. But the flavor is completely different. Curing concentrates umami in an extraordinary way. The gelled white has a texture without equivalent—firm but with slight tremor. The flavor is salty, complex, with depth that normal boiled egg doesn't have. The yolk is creamy, with flavor reminiscent of blue cheese in intensity but with completely different profile. Very slightly bitter at first, with a long umami finish.
The most cited story places the discovery about 600 years ago, in Hunan. A builder found duck eggs submerged in lime water puddles for two months and tried them. They were perfectly edible and tasted good. Lime produces calcium hydroxide—alkaline enough to initiate curing. That someone tried those eggs and decided to reproduce the process requires much hunger or much curiosity. Possibly both.
At HAMMER, the century egg appears in grilled eggplant (皮蛋烤茄子). The eggplant is roasted whole over flame until the skin is charred and the inside completely soft. It's peeled, shredded into strips, and dressed with sesame oil, soy sauce, fresh chopped garlic, rice vinegar, and Sichuan pepper. Over those strips go pieces of century egg.
The smoky softness of the eggplant contrasts with the gelled firmness of the pidan. The umami flavors enhance each other. Garlic provides freshness and aromatic power. The whole has a completely unexpected complexity if you were only expecting "eggplant with egg."
It's on our menu. If you haven't tried century egg, this is the dish to start. If you arrive and feel that "no, not that" reflex—we ask you to reconsider. Try a piece of eggplant with pidan together. If afterward you don't want more, we'll respect your opinion. But you have to try it first. HAMMER Madrid and Barcelona, same menu, same philosophy.
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