What You Need to Know
The batter undergoes lactic acid and yeast fermentation at 20–25 °C for 12–24 h, lowering pH to 4.5–5.0 and generating CO₂, ethanol, and flavor volatiles. During pan steaming, the surface temperature of 180–200 °C triggers a Maillard reaction between reducing sugars and amino acids, yielding golden brown crusts and nutty aromas. The combination of fermentation‑induced softening and steam cooking preserves heat‑labile nutrients while maintaining a moist interior.
The Science
Primary Reaction
fermentation (lactic acid & yeast) + Maillard surface reaction