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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Freeze-drying, or lyophilization, is like âsuspended animationâ for food. In this process, fresh or cooked food is rapidly frozen and placed in a vacuum. The finished product is substantially lighter and more compact, making it a great option of lightweight backpackers. Virtually any food item and ingredient can be freeze-dried. To do this however, specialized equipment is required, making it a costly option.