What You Need to Know
The process hinges on starch gelatinization at 100 °C, followed by acid–sugar–salt interaction that stabilizes the rice structure. The vinegar mixture (acetic acid, sugar, salt) lowers the pH, enhances flavor, and preserves the grain. Mechanical pressure in nigiri and ambient temperature control during rolling maintain texture and safety.
The Science
Primary Reaction
Starch gelatinization and acid–sugar–salt interaction with rice