Begin by pre-chilling the freeze dryer, waiting 30 minutes before adding fruit.
If desired, dice or puree raspberries. Berries can also freeze-dried whole.
(Optional) Line trays with parchment paper or silicone mats for easier cleanup.
Arrange the raspberries in a single layer on trays.
Once pre-chilled, place your trays in the freeze dryer.
Close the door and press “continue” to set the machine to a full freeze-dryer cycle. Raspberries usually take 24 to 26 hours to fully freeze dry, but this can vary based on the size of the fruit, moisture content and whether fruit is pre-frozen or not.
Once the cycle is complete, open your freeze dryer and check to see that raspberries are completely freeze-dried. (They should be brittle, dry and firm). If they are not, add a few more hours to the dry time.
When fruit is dry, remove the trays and pack raspberries for storage. Be sure containers are airtight.
Finish by setting your machine to defrost while you put your fruit away for storage.
Notes
Pre-Freezing
Pre-freezing raspberries is optional, but can shorten the processing time. Raspberries can be pre-frozen on trays to shorten freeze-drying time.
Storage
For long-term storage, pack freeze-dried raspberries in mylar bags with oxygen absorbers. This method should keep food at quality for upwards of 30 years. For short-term storage (use in 1 to 2 years), a mason jar with a tight-fitting lid should work fine.
Reconstituting
To rehydrate raspberries, place them in a bowl and cover the fruit with warm water. Soak for 20 to 30 minutes, then drain off excess liquid. Rehydrating fruit is optional. Freeze-dried raspberries are perfectly safe to eat right out of the jar!Refrigerate raspberries once rehydrated.