Start by sterilizing your mason jars and lids. You can do this by boiling them in a large pot of water for 10 minutes. Remove them from the water and let them air dry.

Once the jars are dry, fill them with the prepared raspberries. Be sure not to overfill the jars. Leave about 1 inch of headspace at the top of the jar.

Seal the jars with the lids and tighten them securely.

Store the jars in the refrigerator. Raspberries stored in this manner will typically last for up to 5 days.