How do you reboil jars filled with jam?

Reboiling jars filled with jam, also known as "reprocessing," is an important step in the canning process to ensure proper preservation and shelf stability of the jam. Here are the steps on how to reboil jars filled with jam:

1. Prepare the Jars:

- Ensure that the jars you're using are clean and sterilized.

2. Heat the Water:

- Fill a large pot or canner with enough water to cover the jars by about 1-2 inches.

- Bring the water to a boil over medium-high heat.

3. Place Jars in the Boiling Water:

- Using a jar lifter or tongs, carefully place the sealed jars with jam into the boiling water.

- Make sure that the jars are not touching each other.

4. Start Timing:

- After placing all the jars in the boiling water, start timing.

- The processing time for jam varies based on the recipe, altitude, and jar size. Follow the processing time specified in the recipe.

5. Maintain the Boiling Temperature:

- Keep the water at a steady boil throughout the processing time.

- Adjust the heat if needed to maintain the boiling temperature.

6. Remove the Jars:

- After the recommended processing time is complete, carefully remove the jars from the boiling water using a jar lifter or tongs.

7. Cool the Jars:

- Place the jars on a wire rack or a folded kitchen towel to cool for at least 12-24 hours.

- During cooling, the seals will form, creating an airtight vacuum.

8. Check for Seals:

- Once cooled, check the jars for proper sealing. Press the center of the lid to make sure it doesn't flex or pop up when pressed.

- Jars that have sealed properly will have a "pop" sound when you press the center of the lid.

9. Store the Jam:

- Store the sealed jars of jam in a cool, dry place, such as a pantry or cupboard, away from direct sunlight.

Remember that reboiling jars is a crucial step to ensure the safety and quality of your homemade jam. Always follow the recommended processing time and guidelines provided in reputable sources to ensure proper preservation.