What You Need to Know
Boiling gelatinizes the starch, reducing raw starch content and making sugars available for fermentation. Lactic acid bacteria metabolize these sugars to produce lactic acid, lowering the pH to 4.5–5.0 and inhibiting spoilage organisms. The acidic environment also imparts a characteristic sour flavor while preserving the paste for up to two weeks when refrigerated.
The Science
Primary Reaction
Fermentation of starch-derived sugars by lactic acid bacteria to lactic acid