Chén cù (aged vinegar) is a traditional Chinese condiment made by fermenting grain—typically sorghum, wheat, or barley—for at least one year, often much longer. The character 陈 (chén) means 'aged', 'stored', or 'matured', emphasizing the extended fermentation time that develops its deep brown color, rich aroma, and mellow, complex sourness. 醋 (cù) simply means 'vinegar'. Together, 陈醋 refers specifically to this time-aged variety, distinguishing it from younger, sharper vinegars like 米醋 (mǐ cù, rice vinegar).

This vinegar is especially associated with Shanxi Province in northern China, where it’s produced using ancient methods and is prized for both culinary and medicinal uses. It’s commonly used in cold dishes, dumpling dipping sauces, noodle soups, and braised meats—not just for acidity but for depth of flavor and perceived health benefits like aiding digestion. Unlike Western vinegars, chén cù is rarely used for cleaning; its value lies entirely in food and tradition.