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Grape Jelly
Grapes for jelly should be used before they are ripe, or when just turning. Stem the grapes and slightly cook them; then strain and use a pint of sugar to a pint of juice. It makes the jelly of a light-red color, and much finer flavored than ripe grapes.
A three-sentence jelly recipe that assumes you already know how jelly behaves. The important instruction is the first one, and it is the reason the recipe works at all.
- Why underripe grapesPectin and acid both peak just before full ripeness and fall away as the fruit sweetens, so green-shouldered or barely-turning grapes set firmly without added pectin. Fully ripe Concords will give you syrup unless you add commercial pectin or blend in some underripe fruit.
- "Slightly cook them"Crush the stemmed grapes in the pot, add a splash of water only if they are dry, and simmer 10 minutes at most, until the skins have burst and the flesh has gone slack. Long boiling of the pulp extracts bitterness from skins and seeds and dulls the light-red color the recipe is after.
- A pint to a pintThis is volume, not weight: 2 cups of juice to 2 cups of granulated sugar, about 14 oz. By weight that is a little less sugar than the pound-for-pound proportions some period jelly recipes call for, which is workable here because underripe grapes are so acidic.
- StrainingPour through a scalded jelly bag or a double layer of damp cheesecloth and let it drip without pressing. Squeezing forces through pulp and clouds the jelly, which for this recipe defeats the whole point of the color.
- Knowing when it is doneBoil the juice and sugar hard and uncovered; the set point is 220F at sea level, or 8F above the temperature at which water boils in your kitchen. A cold-plate test works too: a spoonful chilled a minute should wrinkle when pushed.
- YieldRoughly 4 lb of grapes should give something like 4 cups of juice; expect in the region of four half-pint jars, though the recipe gives no yield of its own.
- Sealing and storageThe book's era sealed jelly with melted paraffin, which is no longer considered a reliable seal. Refrigerate the jars and use within a few weeks, or follow current water-bath processing guidance for shelf storage.
- Tartrate crystalsGrape juice throws gritty crystals of potassium bitartrate on standing. Letting the strained juice sit overnight in the cold and then decanting off the clear liquid prevents crunchy jelly.
Grape jelly of this kind belongs to the American home-preserving tradition that grew up around the Concord grape, a native Labrusca selection introduced in Massachusetts in the mid-nineteenth century and widely planted in the Northeast. Household cookbooks of the period treat jelly-making as an exercise in judging fruit rather than following a formula, which is why the instruction here is almost entirely about when to pick: commercial liquid pectin appeared around 1912-13, with powdered pectin considerably later, so before that the cook's pectin came from the fruit's own ripeness, or lack of it. The preference for underripe grapes seems to have been a common theme in nineteenth-century preserving manuals, and the pale red color it produces is genuinely different from the deep purple jelly most readers now associate with the name.