In the ancient capital of Luoyang, where peonies have bloomed for over a thousand years and dynasties have risen and fallen, there is a dish that captures the city’s soul in a single bowl. Known as Peony Bird’s Nest (牡丹燕菜) – or, more formally, Luoyang Yancai (洛阳燕菜) – this exquisite soup is the undisputed…