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Grape Marmalade
Take grapes and pulp them, put a little water on them, barely enough to cover, let them cook slowly until the seeds separate easily; then rub them through a sieve, and the seeds will all come out; cook the skins tender, putting a little water on them to prevent their burning, then add the pulps and three-fourths pound sugar to one pound fruit; boil until thick.
A two-part method that still gives the best texture of any grape jam: skins and pulp are cooked separately, then reunited. The one thing to get right is the sieving step, which happens while the pulp is hot and loose.
- "Pulp them" means slip the skinsSqueeze each grape so the jelly-like interior pops out into one pan and the skin drops into another. This is only practical with slip-skin grapes such as Concord, Catawba or Niagara; seedless table grapes have nothing to separate and will not work with this method.
- Sieve the pulp hotCook the pulp only until the seeds loosen, roughly 5 to 10 minutes, then push it through a medium sieve or food mill immediately. Once it cools it stiffens and the seeds cling.
- The skins take longer than you expectSimmer them with a few tablespoons of water, perhaps 15 to 20 minutes, until they no longer feel leathery. The recipe adds the water only to stop them catching, so watch rather than cover and forget. Undercooked skins tend to stay chewy in the finished marmalade.
- Sugar ratioThree-quarters pound sugar to one pound fruit is roughly 1 3/4 cups sugar per pound. The recipe does not say whether the pound is whole grapes or the prepared pulp and skins. It is a leaner ratio than a pound-for-pound preserve, so expect a softer set and shorter keeping life.
- Judging "boil until thick"No pectin is added; the set comes from the grapes themselves and from evaporation. Look for 220F on a thermometer, or drop a spoonful on a chilled plate and check that it wrinkles when pushed.
- Watch the bottomGrape pulp scorches easily once thickened. Use a wide, heavy pan, stir across the base, and accept that the last ten minutes need attention.
- Yield and storageThe original says nothing about sealing or quantity; refrigerate it and use within a month, or follow current boiling-water canning guidance for jams if you want it shelf-stable.
Marmalade in nineteenth-century American cookbooks did not mean citrus specifically; it meant any fruit cooked to a thick, uniform mass, in contrast to jelly (strained clear) and preserves (fruit kept whole in syrup). Grapes turn up constantly in these books because slip-skin American varieties, above all the Concord introduced commercially in the 1850s, grew readily on arbors and back fences from New England through the Midwest, and a heavy crop had to be dealt with in a week. The seeds are the reason for the fussy two-pan method: they are large, bitter, and awkward to remove before cooking, so the pulp gets sieved and the skins, which carry nearly all the color, are cooked separately and stirred back in.