Flash-freezing, either by pouring liquid nitrogen over a bowl of food or by placing food onto an anti-griddle.

速冻，要么将液氮浇在一碗食物上，要么把食物放置于“反扒”设备上。

youdao

Clarence Birdseye, who, in the 1920s, developed techniques for flash freezing food.

ECONOMIST: Low temperatures

If America hadn't gone to war, a man named Birdseye wouldn't have figured out he could preserve food for our troops by flash freezing it in cold water.

NPR: Linda Ellerbee, Taking 'Big Bites'

In 1916, Clarence Birdseye perfected the flash-freezing process (and Birds Eye potato puffs).

FORBES: 12 Rules For Game-Changing Entrepreneurs