I am looking for the criteria that make an acceptable recipe for canning. Most sites say to only use approved canning recipes and not make substitutions, which is totally understandable, but surely there must be some guidelines for what makes those recipes acceptable? What levels of salt, acidity, water activity, etc make a recipe suitable to be canned?
What are the guidelines for creating a canning recipe
canningfood-preservationfood-safety
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Best Answer
Nearly any recipe can be canned, the only caveats are that lower-acidity foods and recipes require a specialized pressure canner to kill bacteria, and there is also a short list of ingredients which are never a good idea to can, but many people wouldn't think twice about adding/subbing into a recipe - fats, dairy and eggs shouldn't be in a canning recipe because they'll still go rancid, grains and flours are good insulators and will actually protect bacteria from the heat, and thickeners that people will often throw into a recipe like cornstarch or tapioca will chemically break down from the canning heat. You'll find plenty of cases of people canning grainy/floury things anyway with no ill effect, but that simply means there was no bacteria to kill in the first place. Better safe than sorry.
Most people don't even know what pH is, let alone how to test it or how a recipe alteration would change it. They also aren't going to know much about bacterial growth conditions or heat transfer. It's a heck of a lot easier for a recipe site or book to just say "no substitutions" than to try to teach people how to do it safely, especially when there's plenty of idiots who wouldn't pay attention and sue when they get bacterial poisoning.
So there's really only two guidelines you really have to worry about for your recipes:
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