What You Need to Know
During steaming, the 100 °C steam penetrates the porous bamboo walls, gelatinizing amylopectin and amylose in the glutinous rice batter. Simultaneous lactic‑acid fermentation lowers the pH to 4.5–5.0, enhancing gelatinization and reducing stickiness, while heat‑induced lignin breakdown releases phenolic compounds that contribute to aroma and a subtle bitterness if over‑steamed.
The Science
Primary Reaction
Starch gelatinization + lactic‑acid fermentation