In a Nutshell: Think of 卤水 not as a simple broth, but as the “sourdough starter” of the savory world. It's a complex, dark, and fragrant liquid made from soy sauce, rock sugar, water, and a symphony of spices like star anise, cinnamon, and Sichuan peppercorns. Food is simmered in it until tender, absorbing its incredible flavor. The magic is that after each use, the liquid is strained, stored, and reused, absorbing the essence of everything cooked in it and growing more complex and valuable over time.