Freezing Blackberries for Jam

The initial step to making jam from frozen blackberries starts with the highest-quality fruit. Find ripe and plump blackberries with no bumps, bruises, or other imperfections. Pick berries in their prime in ripeness to get the most taste and flavor in the jam you choose to make.

Cleaning and Preparing

Prior to freezing blackberries, it's important to cleanse and properly prepare them. The steps are as follows:

Gentle washing: Wash the blackberries in cold running water, removing the dirt or other particles. Be careful not to soak them in water, since blackberries are prone to absorb water, and then become soft.

Drying: Wipe the blackberries dry using an unclean kitchen towel or newspaper towels. It is important to ensure that the berries are dry prior to freezing in order to avoid the formation of ice crystals on the blackberries.

Remove Stems: Examine the blackberries to see if there are any leaves or stems and then remove them with care. Only pick the mature fruit, with no green part.
 

Freezing Blackberries

When your blackberries are cleaned and dried, it's now time to put them in a freezer so that you can make jam. The steps are as follows:

Single Layer Freezing Spread the berries in a single layer onto a baking tray lined by parchment paper. Be sure that they aren't touching each other in order to avoid the berries from getting stuck together.

Flash Freeze: Put your baking pan with blackberries into the freezer for some time or until they are completely frozen. This method, called flash freezing, stops the berries from colliding together. It also allows you to divide them up for jam making.

Transfer to containers: When the blackberries have frozen, move them into sealed freezer bags or airtight containers. Get rid of as much air as feasible from the containers prior sealing them, to prevent the risk of burning in the freezer.