What does „Freeze-dried“ mean?

Freeze-drying is a technical drying process which takes advantage of water‘s unique physical characteristics. In a vacuum chamber, frozen water transforms directly from a solid state into gas (Sublimitation). Freeze-dried meals are made by instantly freezing foods and then drying it in a vacuum chamber. In this manner, the water within the food does not melt; but is removed as steam. All that is required to restore the food is hot water. The light weight, simple preparation and fuel savings have caused mountain climbers, expeditions and trekkers to embrace freeze-dried foods-which are quickly becoming a part of all outdoor activities.