1 Bring a large pot of water to a gentle boil. Carefully submerge filled jars. Ensure that jars are covered by at least 1" of water.
2 Let jars sit for 15 minutes. Then, using tongs, transfer jars to a dish towel; let cool. As jars cool, you will hear lids pop.
3 To test the seal, press down on center of lid, and then release your finger. If the lid remains depressed, it's properly sealed.