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Barberry Jelly
The fruit should be quite ripe. Strip the berries, wash them in clear spring water, and put them into a jar with only the water that clings to them. Place the jar in a vessel of boiling water; cover the top of the jar, and in one hour they will be fit to strain. To every pound of juice put one pound and a quarter of sugar; boil quickly five minutes. Probable cost of barberries, 4d. to 5d. per pint.
A steam-extraction jelly of the old school: no added water, no thermometer, and a sugar ratio that leans on the barberry's very high natural pectin and acid. Most of the work is in the extraction, which is gentler and slower than boiling fruit in a pan.
- The hinge: extract, don't boilThe jar of fruit sits in a pan of boiling water, so the berries never exceed about 100C and never catch or scorch. This is a bain-marie; a heatproof bowl over a pan of simmering water, or a covered jar standing on a folded cloth in a deep pot filled to the shoulder, does the same job.
- BarberriesBerberis vulgaris, the hedgerow barberry, once common in Britain and now rarely sold fresh. Farmers' markets and Middle Eastern grocers are the likeliest source; the dried Iranian zereshk is the same or a closely related Berberis, and will need soaking and gives a different, less clean-tasting juice.
- StrainingThe original assumes a jelly bag. Let the pulp drip through scalded muslin or a jelly bag without squeezing, or the jelly turns cloudy. An hour's extraction usually yields a thin, intensely red juice; overnight dripping is normal.
- Sugar by weight of juiceA pound and a quarter of sugar to a pound of juice is 1.25:1 by weight, higher than the 1:1 most modern jellies use. Barberries are sharp and pectin-rich enough to carry it. Weigh the strained juice rather than measuring by volume.
- Five minutes is a guide, not a ruleWith this much pectin and acid a set often arrives quickly, but hob output and pan width vary. Test for setting point at 105C, or with the cold-saucer wrinkle test, rather than trusting the clock.
- JarsThe book says nothing about sealing; Victorian preserves were commonly covered with a paper disc and tied paper or cloth over the top. Pot into hot sterilised jars and seal at once; refrigerate after opening.
- YieldA pint of barberries gives only a modest amount of juice, and barberries vary a great deal in juiciness; the book gives no yield.
- The price note"4d. to 5d. per pint" is fourpence to fivepence in pre-decimal money, included because Cassell's gives a probable cost for most of its recipes. It records that barberries were then an ordinary marketed fruit.
Barberries were a standard English hedgerow and cottage-garden fruit, valued less for eating than for their acidity: the juice was used in jellies to serve with mutton and game, and whole sprigs were candied or used to garnish sweet dishes. Their disappearance from British and American landscapes is well documented and has nothing to do with taste. Berberis vulgaris is an alternate host for wheat stem rust, Puccinia graminis, and organised eradication campaigns, most famously the United States federal programme begun in 1918, pulled out barberry bushes by the million; in Britain the folk association between barberry and blighted wheat is old and attested, though how far it led to organised grubbing-out before the nineteenth century is uncertain. Cassell's, compiled when the shrub was still ordinary enough to have a market price per pint, records a preserve that within a couple of generations became genuinely hard to make.