Zaopocu

Zaopocu is a thrift dish of the fishing town of Puqian in Wenchang, Hainan. When locals brewed rice wine, the spent lees left behind were not discarded but fermented further, then thinned with water and cooked down with chili and garlic into a vinegar carrying notes of vinegar, rice, garlic and pepper at once — its name literally means 'dregs vinegar.' Locals also call it 'women's vinegar' for a reputed nourishing quality. Long a humble street snack for simmering sea vegetables and shellfish, it broke out around 2023 to 2024: vendors paired the broth with seasonal seafood as a 'sea pot,' it became a hotpot in its own right, and short-video check-in culture turned it into one of Hainan's most-photographed eats.

The first thing is the smell — sour and faintly winey, with a fermented funk underneath and a strong garlic lift. The broth is thin and tangy, not sharp like table vinegar but rounded, with a low rice sweetness and a chili warmth running through. You poach things in it: clams, conch, sea snails, offal, sea vegetables, fish, and the broth strips away any fishy edge and leaves the seafood tasting cleaner and sweeter. By the end the soup, now soaked with the brine of everything cooked in it, is the best part to drink.

The whole dish rests on a second fermentation of rice-wine lees. After the wine is drawn off, the lees still hold yeast, residual sugars and live cultures; left to ferment on, acetic-acid and lactic bacteria convert those into organic acids, building a soft, complex sourness alongside lingering esters that read as a winey aroma — quite different from the single sharp note of distilled vinegar. Diluting and simmering it with garlic and chili tempers the acid and rounds the flavor. In the pot that acidity does real work: a mild acid bath denatures surface proteins and suppresses the volatile amines behind fishy smells, so seafood poached in it tastes cleaner and its sweetness comes forward.