thanks, I canned 3 jars worth of ground meat and kept the fat in it. The left jar lid didn't want to suck down even after an hour, I put a teaspoon of cold water on lid and it popped instantly and remains stuck on. I can't remember if I learned that hack online. I don't even remember if it's a good hack or a no-no hack.
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I've read that it's best practice to just refrigerate and eat within a week if your lids don't set. So I think it's a no-no hack, especially if you're planning to store your canning for a few years.