How does it work? I do not get it my brain won’t comprehend how you can freeze something and also remove moisture without heat
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The lower the pressure, the lower the boiling temperature of water. You freeze something in a vacuum, and the ice sublimates; meaning it goes directly from solid ice to water vapor, which is then removed by the vacuum pump.
This leaves the food extremely dry, which is good for long term storage. Bacteria, mold, fungi and yeast, all the things that make food go bad require water to live. No water, no spoilage.
It doesn’t do much for the flavor or texture, though. Freeze dried foods tend to be crunchy and near flavorless unless rehydrated.
Astronaut ice cream is freeze dried normal ice cream. But it barely has any flavor left.
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