8. Pasteurize the Jars
Bring the water to a gentle boil. Once boiling, reduce the heat slightly and pasteurize the jars for 30 minutes. This heat will kill any lingering bacteria while keeping the fruit intact.
9. Let the Jars Cool Down in Water
After 30 minutes, turn off the heat and let the jars cool completely in the water. This gradual cooling process helps create a strong vacuum seal and prevents the jars from cracking.
10. Store in a Cool, Dark Place
Once completely cooled, remove the jars, dry them, and store them in a dark pantry or cupboard. Properly sealed jars can last several months, making them perfect for enjoying blueberries out of season.
