What You Need to Know
The batter is kept near 0 °C to suppress gluten development, allowing the starches to gelatinize only when exposed to the hot oil. Rapid heat transfer at 170–190 °C generates steam that expands the batter, creating a light, airy shell. The high temperature also initiates a mild Maillard browning on the surface, giving the coating its characteristic golden color and subtle savory flavor.
The Science
Primary Reaction
steam expansion and Maillard browning