I never had that happen. I have had a jambalaya and a beef stew scorch at the bottom becauseI left it on the heat too long without stirring. Sad! or Bad! (I have experienced the superheated phenomenon many times using a microwave, however).Â
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FWIW, the simmer definition I posted was because I was unaware of what I think is the technical definition. I have not tested this, but I'm not sure there's a temperature difference between a gentle boil (lots of bubbles every second but the liquid isn't totally agitated) vs a rolling boil.Â
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Here's what I feel confident in:
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Botulinum toxin (NOT SPORES) is killed at 10 minutes at anywhere from a simmer to a boil
http://ucanr.edu/sites/MFPOC/Food_Safety/Botulism/
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Cooked sauces made fresh won't have any toxin in them unless you are using spoiled ingredients. Ferments MIGHT (even though probably won't). I know people keep fermented mashes/sauces in the fridge and eat them without cooking. People also ride around without seatbelts. The risk is probably the same. FWIW the FDA recommends all home-canned veggies (even those pressure-canned) be boiled before eating. Overkill? Maybe.
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So what else are we killing? Well just about anything else will die at 160F, including the big three of E. Coli, Listeria, and Salmonella. Lactobacillus too, for those that need to stop a ferment so the bottles don't explode. A "simmer" is minimum 180F
https://www.ars.usda.gov/ARSUserFiles/60701000/FoodSafetyPublications/p328.pdf
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Here's what I take away from this: if your sauce is boiling, by which I mean there are many bubbles coming up every minute, for at least a few minutes, you have killed the relevant nasties except for botulism spores. For a cooked sauce, as long as your pH is <4.0, you should be fine. For a ferment, where you can never know if the pH dropped before botulism had time to reproduce, you should cook at least 10 minutes at a boil (gentle is fine) to ensure all toxin is gone.
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If anyone has better info, then please share. Like SalsaLady and the other folks here, I'm only trying to share accurate information that people can use to keep everyone safe.
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