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Vegetable Soup (Mrs Geo Smith large onions)
Mrs. Geo. Smith. 15 large onions Little parsley Salt and pepper to taste Boil one hour and seal hot. This amount makes about twelve quarts. Prepare a soupbone and cook in usual way. Add canned vegetables and serve.
Mrs. Forrest Thomson.
This is a home-canned soup base — a mixed vegetable pack boiled briefly, sealed hot, and later opened to finish a stock made from a soup bone. The canning half of it is the problem.
- Why the sealing step failsMixed vegetables are low-acid, with a pH well above 4.6. Boiling for an hour and sealing hot gives an anaerobic jar held at temperatures that never approach the 240F needed to destroy Clostridium botulinum spores. Those spores survive an hour at boiling point and germinate in the sealed jar; the toxin they produce is not detectable by smell or appearance.
- No processing time or pressure givenThe instruction is simply "boil one hour and seal hot." There is no pressure, no jar size, no headspace and no processing schedule — none of the measured variables that make low-acid canning safe. A current tested pressure-canning recipe should be used instead.
- Onion is not a preservativeFifteen onions carry no acid or salt load worth counting. Unlike pickles or tomato packs, nothing in this mixture lowers the pH into the safe range.
- The scale involvedThe note that the amount makes about twelve quarts means a large batch of the same unsafe pack, not a single jar. Twelve quarts of an unsafe low-acid product is a large amount of risk to hold in a pantry.
- "Seal hot"Open-kettle canning — filling and capping hot jars with no processing in the sealed state — appears in community cookbooks of this period and is no longer considered acceptable for any low-acid food. A vacuum forming as the jar cools does not indicate sterility.
- The second half of the entryMrs. Thomson's part is only a serving note: simmer a soup bone for stock in the usual way, then add the put-up vegetables and heat through. It presumes the jars already exist and adds nothing to their safety.
Community cookbooks are full of these "canned soup mixture" entries, and they record a late-summer habit: the garden came in all at once, the jars were on hand, and a quart of mixed vegetables in the cellar meant soup later with no more work than boiling a bone. The division of labour in this entry is notable too — one contributor supplies the pack, another the finish, and the book assumes every reader already knows how to "cook in the usual way." Open-kettle canning of vegetables was taught in this form into the twentieth century; the shift to pressure canning for low-acid foods came out of later federal and extension work, and it is the reason the method printed here reads as unremarkable in its own period and unusable now.