Fresh or cooked food is put into the freeze dryer on trays and frozen to -40 F or colder. This is called lyophilization.
Once frozen the food is vacuumed inside the freeze dryer chamber and the moisture in the food evaporates and changes from solid to gas without going through the liquid state. This is called sublimation. The water vapour is discarded.
Once the food is dry the freeze dryer will let you know that the process is complete by beeping.
Remove the food from the freeze dryer and package immediately.
