Tags / 1 quote from 1 source
#secondary-drying
7 Things To Know About The Freeze-dried Food Craze | Mother Jones
Freeze-drying food
Freeze-drying is a three-step process that begins with freezing. Next the food is placed in a vacuum chamber under low heat. The frozen water crystals evaporate directly from ice to water vapor in a process called sublimation. The food then undergoes "secondary drying," in…