Re: Canning soup?
I have not canned clam chowder, but I have canned, broccoli cheese soup, navy bean soup, beef barley, green beans, peaches, beef, chicken, tuna, salmon, apple sauce, jams galore etc.
Here's my take on soup. I don't like to freeze soup, especially with potatoes in it as the potatoes get grainy(in my opinion). Canning, I think soup is an art to can.
Broccolil Cheese soup came out "smoky", meaning the cheese was not burned, but definately overdone, still tasted ok. Navy bean soup had some green beans in it, they came out mushy and a lot of the beans liquified.
Now to the "art" part. I think you need to make sure your soup is slightly "under done" before the canning process in order to maintain the integrity of the food in it. Potatoes need to be a bit firm, etc. Pressure canning sort of turbo cooks stuff.
So yes, in the end, I think this is totally doable, but I also think just canning soup that has already been cooked up will not result in the same or acceptable consistency/flavor.
I know it's not a true answer, but maybe it will help in the process.
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