Questions about food being preserved into glass jars, metal cans, or other air-tight containers using a variety of heat treatment steps to ensure an reasonable level of pasteurisation and/or sterilisation

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4
votes
2answers
965 views

Is it safe to remove the rings on jars for long-term storage of home-canned goods?

Is it okay to store the canned goods without the ring screwed on it? I know someone who removes the screwed rings off her jars once they're processed and then stores her jars with the seal lids only. ...
10
votes
4answers
8k views

Is the double boiling canning procedure really necessary?

It seems the usual procedure is to sterilize cans and lids by immersing them in boiling water, to fill the cans, and then to cap them and boil for a few more minutes. If I sterilize a can and then ...
0
votes
1answer
54 views

Is acid required when pressure canning?

I saw in the answers to this question that acid (like vinegar) is necessary to properly preserve hot sauce, and many other answers here similarly say that a low pH is necessary for safe canning of ...
7
votes
4answers
2k views

New to jam making - do I need to can?

I am a noob-to-be jam maker and a noob seasoned advice member. I want to make this pectin-free jam recipe; but here is the issue: In English speaking sources, any jam recipe goes with instructions on ...
7
votes
5answers
16k views

Minimum procedure for sterilizing mason jars for canning

My wife and I are about to do some tomato canning tomorrow. We have a bunch of mason jars that we didn't have time to sterilize. She thinks that just washing them in hot water is enough. After ...
7
votes
1answer
1k views

How long is SPAM really good for?

I wanted to buy some SPAM for my zombie apocalypse survival kit, and I noticed that it had an expiration date in 2013. Should I be concerned? I've heard it will last more than 25 years.