1. Wash the Berries Thoroughly
Rinse blueberries under cool running water to remove dirt, debris, or pesticide traces. Drain in a colander and pat them dry with a clean towel.
2. Sterilize Jars and Lids
Use clean, airtight glass jars with new lids. Sterilize them by boiling for 10 minutes or running through a hot dishwasher cycle. Ensure they’re fully dry before filling.
3. Fill the Jars
Carefully add the blueberries until the jar is about 2–3 cm from the rim. Keep the berries whole—avoid mashing or crushing.
4. Add Lemon Juice
Pour 1 tablespoon of lemon juice into each 750 ml jar. This increases acidity, preventing harmful bacteria like Clostridium botulinum from growing.
5. Top with Water
Cover the berries with filtered water, leaving 1 cm of headspace for expansion during heating.
6. Wipe and Seal
Clean the jar rims with a cloth to remove any residue, then secure tightly with the lids.
7. Prepare for Pasteurization
Line the bottom of a deep pot with a cloth or towel to cushion the jars. Place them upright, then fill the pot with water until it reaches just below the lids.
8. Pasteurize the Jars
Bring the water to a gentle boil, then reduce heat slightly. Pasteurize for 30 minutes—enough to kill bacteria while preserving texture.
9. Cool the Jars Slowly
After 30 minutes, turn off the heat and let the jars cool in the water. This slow cooling strengthens the seal and prevents cracks.
Step-by-Step Guide to Preserving Blueberries
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