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Cucumber Ketchup
Cucumber ketchup is useful for flavouring sauces which are to be served with rather tasteless meats, such as rabbits, veal, sweetbreads, calf's brains, etc. It is made by paring and mashing cucumbers, sprinkling salt over them, and leaving them for some hours to draw out the juice, which is then strained, and boiled with a liberal allowance of seasoning. The ketchup must be kept in bottles and closely corked. Time, twenty-four hours to extract the juice. Sufficient, two dessert-spoonfuls of ketchup for half a pint of sauce. Probable cost of cucumbers, when plentiful, 6d. each.
This is a store sauce in the Victorian sense: a bottled flavouring meant to sit in the larder for months. The method as printed cannot be made safely today, and the reasons are worth spelling out.
- No acid is specifiedCucumber juice is low-acid, measured at around pH 5 to 5.8, well above the 4.6 threshold below which Clostridium botulinum cannot grow. This recipe names no vinegar at all, so nothing in it brings the acidity into a safe range.
- A corked bottle is not a sealA cork pushed into a bottle of low-acid vegetable juice gives exactly the oxygen-poor, room-temperature environment botulinum spores favour, while doing nothing to keep them out. The single brief boil kills spoilage organisms but not spores, and the recipe gives no processing time, no jar temperature and no headspace.
- The salt is a flavouring, not a cureSalt is sprinkled on only to draw the juice out, and no quantity is given, so there is no measured brine strength and nothing here can be relied on as a preservative. "A liberal allowance of seasoning" is equally undefinable.
- Nothing is out of range for the eater, only for the keeperCucumbers are harmless; the hazard is entirely in the storage method. If you want a bottled cucumber condiment, use a current tested recipe with a measured acid and a specified process.
- Reading the quantitiesFor reference: a dessertspoonful is about two teaspoons, and the half pint of sauce is an imperial half pint, ten fluid ounces. Sixpence is the price given for a single cucumber "when plentiful".
- Why these meatsThe list of "rather tasteless meats" is the useful part of the entry: rabbit, veal, sweetbreads and brains are exactly the mild meats a sharp bottled flavouring was meant to lift.
Ketchup in a Victorian dictionary of cookery means a thin, dark, strongly seasoned bottled liquid, not the sweet tomato paste the word now conjures. The name is generally traced to a Southeast Asian fermented fish sauce, kê-tsiap or similar, carried back to Britain by traders in the seventeenth century; English cooks reproduced the idea with whatever gave a savoury, salty depth, so the standard household ketchups were mushroom, walnut, and oyster, with tomato only one late arrival among many. Cucumber sits at the mild end of that family, and what the entry describes is less a dish than a category of flavouring: a larder of bottled essences let a cook build a sauce for delicate meats in minutes. The reliance on cork stoppers and a single boil reflects a kitchen that understood spoilage as something you could smell, decades before the microbiology of anaerobic bottling was worked out.