posted 1 day ago
I'm pretty sure the official canning advise has opinions. I never bothered to learn who puts those out, but they seem to be updated every few years.
For me, canning is such a new way of preserving foodstuff and it doesn't have obvious warning signs if something goes wrong like mould or bad smells. The biggest problem is neigh undetectable to humans. So I am extra cautious and have not tried the following advise someone gave me.
To devide already canned goods into smaller cans, remove content from the old can and re-boil contents. Then place in new cans as per normal and pressure can (not boil water can). They were very strong and boring about the pressure canning and I tuned out about here. My next memory on this is that it reduces nutrients and flavour. A better alternative is to freeze the contents of a jar we cannot finish within the time limit and this works quite well.
That's second hand advise, so hopefully someone else can chime in here.
The short notes at the bottom of my memory box for this topic is "exposure to air can amplify any errors in the canning and add more, so second canning should be avoided or pressure." There are a few books in my citation section. Most aren't modern enough to have good grasp on bacteria sicence. The one from the 1980s by a company maybe called Bell or Ball (same word as on old jars) and another from the early noughties (2000s) by the company that sells lids and pectin locally, both say "don't".
Edit to add, I use a box and shelf system for my memory palace. It's weird, but works.