How to Can Whole Tomatoes with a Water Bath

Step Twelve:

Lastly, you will remove the jars from the canner and place them on a towel to allow them to cool completely. I usually leave my jars untouched over night. As the jars cool, the lids should seal. You will hear them make popping noises. Once the lids have sealed, you can remove the rings and reuse them. 

It’s a really good idea to rinse the jars with warm water to clean any residue from the tomatoes. This will prevent mold from growing on the outside of the jars. And finally, dry the jars, label them, and store in a cool, dark place.