Bamboo shoots fermented in salted water for about a month until sour, with a strong smell. Most Guangxi homes keep a crock of them; they are a core ingredient of 螺蛳粉 and are stir-fried with beef or pork.
Sour bamboo shoots are made by sealing bamboo shoots in water to ferment; they smell bad but taste good.
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The sour taste comes from fermentation, not vinegar, and the strong smell mellows the longer the shoots ferment. A traditional relish of the Miao and Dong peoples, it is a key ingredient of Guangxi cooking. Not the same as 笋干, dried bamboo shoots.