Step 8Fill The Jars
If any gets on the lip of the jar wipe it off carefully so the lid will seal well.
Leave a little bit of an air gap at the top.
When the air cools off later, it will contract making a vacuum.
That will make the lid go "ping" and suck inward.
Later on when you open the jar, you'll check that the lid is still sucked down. When you open the lid, hear the air suck in as the lid pings up. That's the sound safe canned food makes.
If that doesn't happen it means it wasn't sealed properly. Be afraid.
If the lid is bulged up, you're in trouble.
You've maybe got a witch's brew of festering botulism in there. Throw it away.
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