Quote:
Oven canning was developed for
dry goods.
Air is a very poor conductor of heat. You need temps well over the boiling point of water to kill botulism. Only way to do that is under pressure.
I've had food poisoning before. It was a very horrible few weeks. I'm not going with any risk of food poisoning that can actually kill me.
I check the seals on every jar before I use it. Even on the high acid, high sugar jams and grape juice.
I know this is redundant for Dave, Hinotori, and some others, but pressure canning is only needed for
some foods including meat, fish, and low acid foods like green beans, etc. Pickles, Jams, Jellies, and fruit are classic examples of foods that do
not have to be pressure canned. I don't want newbie canners to be frightened off thinking everything requires a pressure cooker! My rule of thumb is, When In Doubt -- Freeze It!
I water bath the jams, juice, and fruit. Been doing that for years. Great Grandma used wax for sealing jams (which used to be standard). Grandma used water bath and lids because to many jars of jam would mold that way. With water bathing she very rarely had a jar not seal and no mold issues.
My SIL made tomato sauce a couple years ago. Didn't sterilize the jars. Didn't add acid to them. She thought you just had to add a tablespoon of vinegar to the water in the canning kettle to raise acidity. She ran them 5 minutes. My brother refused to eat it since he grew up with good canning practice. I guess it was a huge fight. Mom said the jars sat on the counter for a few months. Then the seals started popping from pressure. It was stupid. She'd asked my mom how to do them before starting because it was her first try canning and ignored what she was told. I almost got her a blue book for christmas that year.
Mom called me about 8 times yesterday because she was making pepper jelly for the first time, wanting me to keep looking up the recipe and canning instructions. Mom was worried the vinegar wasn't enough acid.
My uncle and I have Mom using extra acid in all jams now, too. Even on the fruits that don't need a little extra acid. Fresh lemon juice. It helps retain the color of the jams better.
I grew up using parafin to seal jelly glasses and did it for decades and never had an issue, BUT we were always careful to check them periodically and before serving. I freeze anything with tomatoes, but don't do much more than chunked up tomatoes to use for cooking. Same with pumpkin and squash. I had a jar of green beans go bad once because the seal popped loose, but it was super obvious. NO one would have touched those with a ten foot pole!
hehe I've been researching the story behind water bathing, it's tricky trying to find actual documentation, why and where it started, etc. 99.99% of what I've found is simply writers quoting earlier writings, so I'm continuing to search. But it boils down to a few critical elements -- getting the food hot enough long enough to kill germs, sterilizing the containers, and creating an air tight seal. I love being able to preserve good fresh foods, knowing exactly what's inside and knowing I had a hand in it. If it's food I've grown myself I enjoy it that much more.