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Canned Currants
Look them over carefully, stem and weigh them, allowing a pound of sugar to every one of fruit; put them in a kettle, cover, and leave them to heat slowly and stew gently for twenty or thirty minutes; then add the sugar, and shake the kettle occasionally to make it mix with the fruit; do not allow it to boil, but keep as hot as possible until the sugar is dissolved, then pour it in cans and secure the covers at once. White currants are beautiful preserved in this way. Mrs. Wm. Patrick, Midland, Mich.
This is open-kettle canning, a method that current food-preservation guidance abandoned decades ago, and this version is riskier than most because it deliberately keeps the fruit below boiling. The notes below explain the failure points rather than offering a corrected procedure.
- Sealed below the boilThe instruction "do not allow it to boil, but keep as hot as possible" is the heart of the problem. Fruit held at some undefined temperature under 212F and then sealed has not been heated enough to reliably kill yeasts and moulds, and the jar contents are not hot enough to pull a strong vacuum as they cool.
- No processing stepNothing here goes into a boiling-water bath after filling. Modern practice processes filled jars of currant preserve for a measured number of minutes precisely because filling hot and sealing does not sterilise the headspace, the rim or the underside of the lid.
- "Cans" and "covers" are not modern jarsIn 1877 this meant tin cans soldered shut or early glass jars with zinc caps and rubber rings, sealed while the contents steamed. Two-piece lids on today's jars are engineered to seal during and after a timed water bath, and behave differently from what the recipe assumes.
- Spoilage you can taste, and spoilage you cannotCurrants are high in acid and sugar, so the classic hazard is surface mould and fermentation rather than botulism. That is not reassurance: mould in a sealed sweet preserve can raise the pH locally and the jar may look sound long before it smells wrong.
- The sugar ratio is not the safety marginPound for pound sugar to fruit gives a very sweet, jam-like set and does lower water activity, but sugar concentration alone is not a reliable control.
- If you want the resultCurrants preserved whole in heavy syrup, white currants especially, are worth making. Use a current tested recipe with a stated boiling-water-bath time for your jar size and altitude.
Currants were a common crop in nineteenth-century American kitchen gardens because the bushes are hardy, crop heavily in summer and need almost no attention, and household manuals of the period commonly carry a run of currant recipes: jelly, shrub, wine, and preserves like this one. Buckeye Cookery, compiled in Ohio and published in 1877, printed contributions under the names and towns of the women who sent them in, which is why a Midland, Michigan cook appears here; the book is a snapshot of what was cooked in Midwestern kitchens rather than a professional's system. White currants, singled out at the end, are a pale cultivar of the same species as the red and were valued for looking almost translucent in the jar. The whole method reflects the period before reliable home canning: cooks trusted the seal itself to do work that we now know only sustained heat can do.