Foodgeist is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. As an Amazon Associate we earn from qualifying purchases.
Step-by-Step Tutorial
PRACTICAL WALKTHROUGH · PARAMETERS · COMMON MISTAKES
Freeze‑drying removes water from food by sublimation under vacuum at sub‑zero temperatures.
Origin: Japanese (1950s) — Japan
See full technique reference →The process involves primary drying (sublimation) at low pressure (0.1–1 kPa) and sub‑zero temperatures (–20 °C to –40 °C), followed by secondary drying at 20–40 °C for 4–24 h to remove bound water. This preserves cellular structure, nutrients, and sensory attributes while preventing enzymatic and microbial degradation.
Primary Reaction
Sublimation of ice to water vapor
Gastronome opens the rest
The Gastronome plan is $7/month (or $70/year). Permanent memory, Verified answers, full library access.