3 ideas
Chinese alcoholic fermentation depends on qu, a cake of cooked or raw grain overgrown with molds such as Aspergillus and Rhizopus, together with yeasts. The mold enzymes convert grain starch into sugar while the yeasts convert that sugar into alcohol in the same vessel. Because the two steps run at once, Chinese grain wines can reach higher alcohol levels than Western beers, which rely on malting to supply the enzymes.
Huang argues that Chinese artisans perfected complex microbial processes centuries before anyone knew microbes or enzymes existed. They did this by recording recipes that fixed the controllable variables: temperature, moisture, timing, and the reuse of good starter cultures. Reading these procedures through modern biochemistry shows they amount to effective strain selection and process control, reached by trial and preserved in text.
Techniques like making tofu, fermenting soy sauce and jiang, and pickling can be read as solutions to specific problems. Soybeans are hard to digest raw and contain antinutritional factors, and processing unlocked their protein. Salt, acidity, and fermentation turned perishable seasonal harvests into stable, flavor-dense foods. Seen this way, a cuisine's signature products reveal the constraints of its agriculture, fuel, and storage.