Century Egg with Tofu

Century eggs originated in early Ming Dynasty Hunan Province: according to widespread historical accounts, duck eggs accidentally preserved in a lime pit in Yiyang (益阳), Hunan were found intact and edible after long exposure, spurring deliberate production. One of the earliest print records appears in a late-Ming household almanac, where the egg was still called 混沌子 (hundun zi, 'chaos egg'). The pairing of century egg with chilled silken tofu as a cold appetizer (凉菜) became widespread in Chinese restaurants during the 20th century, spreading through Hong Kong, Taiwan, and overseas Chinese communities to become perhaps the most recognizable Chinese cold starter globally.

The tofu is cold, silky, and almost impossibly smooth; the century egg arrives in waves — first the sulfurous, alkaline note that some find confronting, then the underlying savory depth, and finally the clean sesame and scallion that the dressing sends over the top to resolve the whole thing into something quietly addictive.

Century egg production is driven by strong alkali (pH 12–14): hydroxide ions penetrate the eggshell via its pores, denaturing the egg white proteins (ovalbumin) into a dark, translucent gel. Hydrogen sulfide released from sulfur-containing amino acids (methionine, cysteine) in the yolk reacts with iron to form ferrous sulfide, producing the characteristic dark grey-green center. The 'pine flower' patterns on the egg white are crystallized amino acid salts. Silken tofu — coagulated from hot soy milk using gypsum (calcium sulfate) — provides a protein-rich, neutral-flavored backdrop whose cold temperature and mild taste directly offset the century egg's intense alkaline punch. A few drops of sesame oil create a competitive aromatic masking in the nasal passage, dramatically improving the overall palatability.