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Corn Pickles
Ten cups corn, ten cups cabbage, six large peppers, two quarts vinegar, two tablespoons salt, one-half pound ground mustard; chop pepper and cabbage and mix with corn; boil all together one-half hour and seal in cans.
— Mrs. Letitia Castle
This is a corn relish of the standard village type, but the canning method behind it is the one that food-safety authorities spent most of the twentieth century trying to stamp out. The proportions are worth reading; the preserving instructions are not usable.
- Open-kettle sealing"Boil all together one-half hour and seal in cans" is open-kettle canning: hot food ladled into jars, lids applied, no processing after sealing. The headspace, the lid rim and the jar walls never reach a reliable temperature, and the seal is formed by cooling steam rather than by a verified vacuum. Modern tested relish recipes require a measured boiling-water bath after filling.
- Corn is a low-acid vegetableSweet corn has a pH around 6.0 to 7.5, and cabbage is not far behind. The safety of a relish like this rests entirely on the vinegar bringing the whole mass below pH 4.6, which is the threshold under which Clostridium botulinum cannot produce toxin. The recipe gives no acidity for the vinegar, so the finished pH of the jars cannot be known.
- Vinegar strength is unstatedNineteenth-century household vinegar was frequently cider vinegar of unknown and variable strength, sometimes well under the 5 percent acetic acid that tested recipes now specify. Without that number the finished acidity of the jars cannot be calculated at all.
- Botulism is silentA jar of under-acidified corn relish sealed this way can look, smell and taste entirely sound. That is precisely the hazard: unlike spoilage organisms, C. botulinum gives no reliable warning in a sealed low-acid jar.
- "Cans" means glass jarsIn a receipt book of this period, "cans" usually means screw-top or wire-bail glass canning jars rather than tin, though tin home canning also existed where the equipment was available.
- Ground mustardHalf a pound of dry ground mustard is a great deal by modern taste, roughly two cups. It served as flavour and as a thickener, mustard being mildly antimicrobial.
- If you want corn relishUse a current tested recipe with specified vinegar strength, jar size and processing time.
Corn relish belongs to the late-summer glut, when sweet corn and cabbage came in together and a farm or village kitchen had to convert more vegetables than anyone could eat into something that would last the winter. Recipes of this shape — corn, cabbage, sweet peppers, vinegar, mustard — appear across American community cookbooks from roughly the 1880s onward, and the family resemblance to chow-chow and to piccalilli is direct. Compilations of this kind tended to print receipts much as their contributors supplied them, which may be why the instructions stop at "seal in cans." Later canning guides such as the Ball Blue Book (first published 1909) and the extension bulletins of the early twentieth century began the work of standardising home processing, and open-kettle canning of low-acid mixtures persisted in farm kitchens for decades after that.