freeze-dry 
verb [with object] (usually as adjective freeze-dried)
Preserve (something) by rapidly freezing it and then subjecting it to a high vacuum which removes ice by sublimation: freeze-dried beef stew...
- The combined extracts were then freeze-dried and kept under vacuum to constant weight.
- Is their experience diminished because they are encumbered with technologies such as ropes, pitons, and freeze-dried foods?
- Then it will take several months to freeze-dry the sections to remove the remaining water, but despite the wait the final result should look excellent.