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Preserved Barberries Cooked
Place berries in double boiler for two hours or till heated through. Remove and weigh. Allow equal weight of berries and sugar but cook berries with no water (on replacing) twenty minutes before adding sugar. When sugar has dissolved, berries soften and juice begins to jell, remove to jars and seal.
A plain equal-weight preserve that relies entirely on the fruit's own acid and pectin. The only real difficulty now is getting the berries.
- Sourcing barberriesCommon barberry (Berberis vulgaris) was the fruit meant here, and it was systematically destroyed across the American grain belt after 1918 as a host of wheat stem rust; several states still restrict planting it. Fresh fruit turns up at Persian and Afghan groceries as zereshk, usually dried, and dried berries will need soaking before you start.
- The double boiler, and "on replacing"Everything happens over simmering water in the top pan of a double boiler. "On replacing" simply means putting the pan back over the water after you have weighed the fruit. The indirect heat keeps small, thin-skinned fruit from catching, which is presumably why it is specified.
- Equal weight sugarWeigh the heated fruit and match it gram for gram. Barberries are aggressively sour and high in pectin, so a full-sugar ratio is doing two jobs here — palatability and set. Cutting the sugar will give you a loose, sharp sauce rather than a preserve.
- No water, and no added pectinThe twenty minutes of dry cooking draws the juice out; adding water only means boiling it off again. Commercial pectin is unnecessary here and can give a firmer, more solid set than the fruit's own.
- Judging the set"Juice begins to jell" is most easily checked by the cold-plate test: a spoonful chilled on a saucer wrinkles when pushed. Over a double boiler it may well take longer than the recipe's brisk phrasing suggests, so judge by the test rather than the clock.
- Sealing"Remove to jars and seal" gives no indication of what kind of closure was meant. Current preserving guidance is to fill clean hot half-pint jars to a quarter inch of the rim and process in a boiling water bath for 10 minutes; otherwise refrigerate and use within a month.
- Yield and useA pound of drained berries with a pound of sugar gives roughly three half-pints. The result is tart and astringent — better beside roast pork, game or a firm cheese than on toast.
Barberries were a standard American kitchen fruit through the nineteenth century: hedges of the common barberry grew half-wild in New England, the berries ripened late and hung on the bush into frost, and their acidity made them useful for jellies, pickles and the candied sprigs used to garnish cakes and cold meats. Their disappearance from cookbooks is unusually well documented — the common barberry is an alternate host for wheat stem rust, and beginning around 1918 federal and state eradication campaigns pulled up the bushes across the grain-growing states, so that within a generation the fruit had gone from a dooryard staple to a rarity. A recipe like this catches the plant at the end of its household career. The fruit survives in Iranian cooking, where dried zereshk is scattered through rice, and in the ornamental Japanese barberry that replaced its banned cousin in American gardens.