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It is also a good time to talk about how we get that food safely onto the shelf.
If you spend much time watching canning videos, you will hear phrases like “rebel canning,” “Amish canning,” and “my grandmother always did it this way.” You may also see very different instructions for canning the same food. It can leave you wondering who to trust.
Respecting tradition while checking the method
When I refer to “rebel canning” here, I mean choosing methods or recipe changes outside current research-tested home-canning guidance. My concern is the actual instruction being shared, not the person behind it.
I also do not use “Amish canning” as a synonym for unsafe canning. Amish people are not one household with one recipe book. A label such as Amish, traditional, homemade, or old-fashioned does not tell me whether a particular recipe and processing method have been tested.
I respect the work and knowledge that families have passed down. We can treasure that history and still check a recipe against current guidance. “We have always done it this way” describes experience. It does not answer every question about what happens inside a jar.
What does “tested recipe” actually mean?
For home canning, “tested” means more than someone made it several times and liked the results. Research-based instructions account for acidity and how heat moves through the food. Thickness, the size of food pieces, packing method, and jar size can all affect that process. A thicker sauce or a larger jar can change how quickly the center heats.
That is why I follow the preparation instructions along with the ingredient list. I do not assume an extra splash of vinegar makes an invented recipe safe, or that extra processing time makes up for a different texture. Some substitutions are supported by research, but I check the specific guidance before making them.
“Both the size and the shape of the jar impact the rate of heat penetration into the container.”
North Dakota State University Extension, Safe Changes and Substitutions to Tested Canning Recipes
Botulism, explained without the science-class headache
Clostridium botulinum bacteria can form tough, dormant spores that occur naturally in soil and can be present on food. Under suitable conditions, including moisture, little oxygen, and insufficient acidity, those spores can grow into bacteria that produce botulinum toxin. A sealed jar of improperly processed low-acid food can provide those conditions.
The spore and the toxin are different. The spore is the resistant form that can survive ordinary boiling. The toxin is the poison the growing bacteria can produce later. Foodborne botulism results from swallowing that toxin. You cannot see, smell, or taste it, and even a small taste of contaminated food can be deadly.
“You cannot see, smell, or taste the toxin that causes botulism.”
Centers for Disease Control and Prevention, Botulism Prevention
This is why “it smells fine” is not a safety test, and why a lid sealing is not proof that the contents received a safe process.
Why acidity changes the canning method
Acidity is measured on the pH scale. A lower number means more acidic. For home canning, the dividing point is pH 4.6: acid foods are at or below that number; low-acid foods are above it. Adequate acidity prevents botulism spores from growing and producing toxin. It does not mean all spores have been destroyed.
You do not need to become a home laboratory to can dinner. Start with a tested recipe. A pH reading by itself does not establish the correct processing method, time, or heat penetration.
Water bath or pressure canner?
| What matters | Water-bath canning | Pressure canning |
|---|---|---|
| Typical foods | Many fruits, jams, jellies, and properly acidified pickles or salsas, using tested recipes. | Plain vegetables, meat, poultry, seafood, and other low-acid foods with tested canning instructions. |
| How it works | Acidity prevents botulism growth; the boiling-water process controls other organisms and helps preserve the food. | Steam under pressure produces the higher temperatures needed to destroy botulism spores with the specified process. |
| Temperature | About 212°F at sea level; lower at higher elevations. | Typically 240–250°F, depending on pressure and elevation. |
| What to follow | The recipe's preparation, jar size, headspace, and processing time, adjusted for altitude. | The recipe's preparation, jar size, headspace, time, and pressure, plus proper canner operation and altitude adjustments. |
Boiling longer is not a safe substitute for pressure canning low-acid foods. An ordinary pot of boiling water cannot reach pressure-canning temperatures. Use the method specified for the food, rather than choosing based on which equipment is already in the kitchen.
A pressure canner also does not make every homemade recipe suitable for shelf storage. There still needs to be a tested process for the food and how it is prepared.
A few examples make it easier
- Plain green beans and pickled green beans are different products. Plain beans need pressure canning. A tested pickled-bean recipe uses a specified amount and strength of acid and may use a boiling-water process. Adding a casual splash of vinegar does not turn plain vegetables into a tested pickle recipe.
- Tomatoes need special attention. Their acidity varies. Follow the required acidification in the tested recipe, including when its pressure-canning option also requires added acid. Do not omit it just because you chose pressure.
- A sealed jar is only part of the story. Pouring hot food into jars and letting the lids seal, sometimes called open-kettle canning, does not replace the recommended canner process. Oven canning is not a recommended substitute either.
Where I look for recipes
These are the sources I turn to when choosing recipes to make and share:
- National Center for Home Food Preservation
- USDA Complete Guide to Home Canning, available free online
- Ball's official canning recipes and current canning books
- Bernardin's official canning recipes
- Penn State Extension's Let's Preserve series
- University of Georgia's So Easy to Preserve
University Extension resources are especially helpful when a recipe leaves me with questions. I also check that instructions are actually for shelf-stable canning, rather than refrigerator or freezer storage. When a blog credits a tested source, I like to compare it with the original recipe before following it. [8]
What if I cannot find a tested recipe?
I do not invent a processing time. I look for a tested alternative or choose another storage method, such as freezing when appropriate. My favorite family recipe can still have a place at the table without needing a place on the pantry shelf.
If a jar was made using a questionable process, I do not taste it to find out whether it is safe. CDC advises against eating food when you do not know whether it was safely canned. Follow its guidance for suspect food rather than trying to rescue it with reheating.
The promise I can make here
I want this to be a welcoming place to learn. Asking a question, checking an old recipe, or changing a habit is nothing to be embarrassed about. I ask questions, too.
I cannot make choices for anyone else's kitchen. I can be thoughtful about what I do in mine and what I encourage others to do. That means sharing tested recipes, linking to the sources, and being clear when something belongs in the refrigerator or freezer.
We put too much work into growing, buying, preparing, and preserving our food to leave the last step to guesswork.
Let's stock our pantries with confidence, one jar at a time. Let's grow together. ðŧ