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<draw deep breath and step on soap box>
While this method, called "open kettle canning", will create a weak vaccuum in the jar, it's not sufficient to kill any spores or bacteria that may remain in the food. What you've recommended is no longer considered a safe method for home canning.
SOURCE: http://www.uga.edu/nchfp/questions/FAQ_canning.html#12
<draw deep breath and step on soap box>
While this method, called "open kettle canning", will create a weak vaccuum in the jar, it's not sufficient to kill any spores or bacteria that may remain in the food. What you've recommended is no longer considered a safe method for home canning.
SOURCE: http://www.uga.edu/nchfp/questions/FAQ_canning.html#12
Why is open kettle canning not recommended?
In open kettle canning, food is cooked in an ordinary kettle, then packed into hot jars and sealed without processing. The temperatures obtained in open kettle canning are not high enough to destroy all spoilage and food poisoning organisms that may be in the food. Also, microorganisms can enter the food when it is transferred from the kettle to jar and cause spoilage.
...and related (same URL, question #3):
In open kettle canning, food is cooked in an ordinary kettle, then packed into hot jars and sealed without processing. The temperatures obtained in open kettle canning are not high enough to destroy all spoilage and food poisoning organisms that may be in the food. Also, microorganisms can enter the food when it is transferred from the kettle to jar and cause spoilage.
...and related (same URL, question #3):
If my recipe doesn't call for processing, do I need to do so?
Many recipes passed down through the years or found in older cookbooks do not include instructions for processing. The foods are usually canned by the open kettle method, sealed and stored. Foods prepared in this manner present a serious health risk particularly low acid foods. To minimize the risk of food spoilage, all high acid foods should be processed in a water bath canner or pressure canner and all low acid foods in a pressure canner.
Do what you wish in your own home, but please please please recommend modern and scientifically-tested canning procedures to BYC users!
</step down from soap box>
Many recipes passed down through the years or found in older cookbooks do not include instructions for processing. The foods are usually canned by the open kettle method, sealed and stored. Foods prepared in this manner present a serious health risk particularly low acid foods. To minimize the risk of food spoilage, all high acid foods should be processed in a water bath canner or pressure canner and all low acid foods in a pressure canner.
Do what you wish in your own home, but please please please recommend modern and scientifically-tested canning procedures to BYC users!
</step down from soap box>