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Pumpkin Chips
Cut pumpkin into small square pieces and cover with lemon juice. Let this stand over night. Make syrup; cook pumpkin in it until tender. Put into fruit jars with some of the syrup.
This is a preserve meant to be sealed and stored, and as written it gives no quantities, no acidity target and no processing at all. Those omissions are the problem.
- Pumpkin is a low-acid vegetableWinter squash sits around pH 5, well above the 4.6 threshold below which Clostridium botulinum cannot grow. A jar of pumpkin in syrup, sealed and left in a cupboard, is close to an ideal environment for it.
- The lemon juice is not an acidification stepAn overnight soak in juice of unstated quantity flavours and firms the surface of the cubes; it does not reliably bring the interior of a dense piece of squash below pH 4.6, and the recipe gives no way to know whether it has.
- No syrup ratio is given"Make syrup" could mean anything from a thin 1:4 to a heavy 1:1. Sugar concentration is the other thing holding a preserve safe, and here it is entirely unspecified.
- Open-kettle fillingHot food ladled into jars and simply capped, with no boiling-water or pressure processing, was common practice in the period and is no longer considered a safe seal. Nothing in the method destroys spores or guarantees a vacuum.
- Cubed pumpkin is a pressure-canning itemCurrent tested procedures for home-canned pumpkin call for cubes packed in water and processed under pressure; syrup-packed cubes and pumpkin butters or purees have no tested procedure at all. There is no adjustment to this recipe that makes it a tested one.
- If you want pumpkin chipsUse a current tested recipe from a food-preservation authority, or cook the syrup and pumpkin and eat it fresh within a few days under refrigeration rather than sealing it for storage.
"Chips" here means nothing fried: through the nineteenth century it described fruit or vegetable cut into small thin pieces and candied in syrup, the same sense that gives us citron chips and watermelon-rind chips. Pumpkin chips were a thrift preserve, a way of turning part of an enormous autumn squash into something sweet and lemon-scented that could hold its shape on a relish plate beside the pickles and the quince. Lemon juice did double duty, brightening a bland vegetable and keeping the cubes firm eed abundant and neutral enough to impersonate more expensive candied fruit. The complete absence of quantities seems characteristic of the genre rather than careless: the terse style suggests preserving was treated as assumed knowledge, and that a housekeeper may have been expected to know what her syrup should be without being told.