Vegetables soured by lactic fermentation, and which ones depends on the region. In the Northeast it is whole napa cabbage, pickled in vats and stewed with pork or put in dumplings; in Sichuan, mustard greens, as in 酸菜鱼.
Sìchuān de suāncài shì yòng jiècài zuò de, hé Dōngběi de suāncài bù yíyàng.
Sichuan pickled greens are made from mustard greens, unlike northeastern sauerkraut.
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Which vegetable it is depends on where you are. In the Northeast, 酸菜 is napa cabbage fermented in big crocks and cooked with pork or in dumplings. In Sichuan and Chongqing it is pickled mustard greens, the sour base of 酸菜鱼. 酸白菜 names the northern kind clearly.