By ZHU XINGXIN and ZHANG LI in Taiyuan, Shanxi Mature vinegar industry follows ancient methods but adds a modern twist Editor's Note: Using a blend of words and visuals, this series explores unique communities and reveals the heart of China through food, architecture, craftsmanship, landscapes and traditions. Qingxu county in Taiyuan, Shanxi province, has been a concentrated production area of …