If Tianjin’s culinary scene were a royal court, the Guifaxiang 18th Street Fried Dough Twist (桂发祥十八街麻花) would undoubtedly be its emperor. As the undisputed first among the “Three Treasures of Tianjin” – alongside Goubuli steamed buns and Erduoyan fried rice cakes– this golden, crispy snack has been captivating taste buds for nearly a century.…