The sour liquid from fermenting celery or cabbage. Around Lanzhou and Tianshui in Gansu it is the cold, sour broth of 浆水面, a summer noodle dish finished with hot oil poured over coriander.
Grandma fermented a jar of jiangshui in the crock.
Tips
culture
A defining flavor of Gansu, Shaanxi and Qinghai cuisine: celery, cabbage or wild greens are submerged in starchy noodle-cooking water and left to ferment for a few days, producing a clear, lemon-tart liquid used for noodle soups (浆水面) and as a summer cooler. The bacteria culture is passed down across generations like a sourdough starter.