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Green Grape Jam
This is made in the same way as grape jam, allowing, however, three-quarters of a pound of sugar to every pint of juice and skins.
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The entry is a variation note rather than a standalone recipe: it assumes you already have the book's grape jam method in front of you and changes only the sugar ratio. Here is what that method involves and what the change means.
- The method it refers toThe book's grape jam recipe is not reproduced here. Period grape jam methods typically involve pinching the skins off the grapes, simmering the pulp until soft, pressing it through a sieve to remove the seeds, then returning the reserved skins to the seedless pulp and cooking down with sugar. Where seeds are present, skipping a sieving step leaves them in the finished jam.
- The ratio, read plainlyThree-quarters of a pound of sugar is roughly 1 3/4 cups, measured against one pint (2 cups) of combined juice and skins.
- Why green grapes take less sugarUnripe grapes are high in acid and pectin and low in their own sugar, so a lower proportion of added sugar can still set, and the result is meant to be sharp rather than sweet. Sugar is still doing work in both the set and the keeping, so reducing it further is not advisable.
- Judging the setThe book gives no time because time depends on your pan and volume. Cook to 220F on a thermometer, or until a spoonful chilled on a cold saucer wrinkles when pushed. With this much pectin it can happen fast, so start testing after about 15 minutes of hard boiling.
- Grapes to useThis works with hard, unripe grapes, historically the thinnings from a vine. Ripe green-coloured seedless table grapes from a supermarket are not the same thing: they are comparatively low in acid and pectin and will make a duller, looser jam.
- Sealing and storageThe recipe gives no sealing instruction. Preserving of this period often relied on paraffin or a paper-and-brandy cover, neither of which is now considered reliable. Follow current boiling-water-bath processing guidance for jams, or simply refrigerate and use within a few weeks.
Green grape preserves are a thrift recipe with a specific origin in the vineyard and garden: vines are thinned in midsummer so the remaining bunches ripen well, and the discarded unripe fruit is intensely acid and full of pectin. Cooks put it to use in jams, verjuice, tarts and pickles rather than throw it out, and the same logic produced green gooseberry and green tomato preserves that sit near it in books of this era. That The Butterick Cook Book (1911), published by a pattern company for a broadly middle-class household audience, includes it as a one-line variation says something about how such books were used: the reader was expected to know the base method and to want the shortest possible note on how to adapt it to whatever the garden produced.