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Blackberry Jelly
Extract juice as from strawberries; allow one pint heated sugar to each pint of juice. May take twenty minutes to jell.
Two lines of instruction that assume you have already read the strawberry entry a few pages earlier. Here is what they leave out.
- "Extract juice as from strawberries"Crush the berries, heat them gently until the juice runs freely, then drain through a jelly bag or several layers of damp cheesecloth without squeezing. Squeezing forces pulp through and gives cloudy jelly. Expect roughly 1 pint of juice from 2 lb of berries.
- A pint of sugar is a volume, not a weightSome nineteenth-century preserving books measured sugar by the cup, others by the pound. One pint of granulated sugar is 2 cups, about 14 oz or 400 g. That gives a slightly lower sugar ratio than a modern weight-for-weight jelly, which is part of why the set can be slow.
- Heated sugarWarm the sugar in a shallow pan in a low oven for a few minutes before adding it; the book gives no temperature. Warm sugar dissolves without dropping the juice off the boil, which shortens the cooking time and keeps the colour bright.
- Use some underripe fruitBlackberries lose pectin fast as they ripen. Include about a quarter slightly red, firm berries, or the twenty minutes will become forty and the flavour will cook flat. No added pectin is needed if the fruit is right.
- Judging the setTwenty minutes is the author's guess, not a rule. Test on a chilled saucer, or take it to 220F on a thermometer, or look for the sheeting stage where the last drops off a spoon merge and fall as a single sheet.
- Boil hard and in a wide panA wide, heavy preserving pan, and keep the batch small; modern guidance generally caps a single batch at around 4 to 6 cups of juice. Deep pans and large batches steam rather than evaporate, and long boiling darkens blackberry jelly.
- JarsThe book most likely assumes paraffin-sealed tumblers. Current practice is hot sterilised jars with two-piece lids, filled to a quarter-inch headspace and processed five minutes in a boiling water bath, or refrigerated and eaten within a month.
- YieldOne pint of juice with 2 cups of sugar gives roughly two to three half-pint jars.
Blackberry jelly earns its place in a book like this because the fruit cost nothing: wild brambles were gathered from hedgerows, roadsides and fence lines across most of the United States and Britain, and a household could put up a winter's worth of jelly for the price of the sugar alone. The terse cross-reference "extract juice as from strawberries" — is characteristic of the period's preserving chapters, which set out one full method and then treated every subsequent berry as a variation on it. The instruction to heat the sugar was commonly given before thermostatic ranges, when adding two cups of cold sugar to boiling juice could stall a batch for several minutes. Blackberry preserves also had a medicinal reputation: blackberry cordial and blackberry syrup were common household remedies for summer bowel complaints, and the fruit appears in nineteenth-century domestic manuals in the sickroom chapter as well as in the preserving one.