Niu Yi Guan Beef Noodle Restaurant is a noodle shop in Zhongshan District, Taipei City, serving beef noodle soup alongside fully vegetarian and lacto-ovo vegetarian versions. Its signature Taiji beef noodle soup combines clear broth and braised broth in one bowl with chewy ramen-style noodles. A sauce corner holds chili oil, mala sauce, and curry sauce, with vegetarian status marked and separate pots and sponges for vegetarian use. The braised broth becomes saltier as you eat.