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Apple Pectin
1 lb. sour apples juice 1 lemon 2 qts. cold water Underripe apples or crabapples may be used. Remove blossom and stem ends, cut in pieces, using skins and cores. Add lemon juice and water enough to barely cover. Cook till apples are soft, strain them through jelly bag without squeezing. Boil the juice 5 minutes and pour into hot sterilized jars and seal.
This is a fruit extract rather than a finished preserve: it gives you a stock of jelly-setting liquid to add to low-pectin fruits like strawberries, peaches or cherries. A few points make it more reliable.
- The water quantity contradicts itselfThe ingredient list calls for 2 quarts of cold water to 1 lb of apples, then the method says to use only water enough to barely cover. Follow the method: barely covering gives a stronger extract, while 2 quarts would need long reduction.
- Underripe fruit is not optionalPectin breaks down as fruit ripens, so ripe apples tend to give a weaker extract. Green windfalls, crabapples, or the trimmings from firm cooking apples are what you want, skins and cores included since both are pectin-rich.
- Do not squeeze the bagPressing the pulp forces starch and fine sediment through and gives a cloudy extract that clouds every jelly you later use it in. Let it drip, an hour or more, and accept the lower yield.
- Test the strength before you trust itThe traditional check: stir a teaspoon of cooled extract into a tablespoon of rubbing alcohol and let it stand a minute. A single firm clot means a strong extract; several soft flakes means it needs further boiling. Discard the test sample rather than tasting it.
- Yield and useA pound of apples gives only a modest quantity of extract, and how much you need per cup of low-pectin fruit juice depends on how strong your batch tests, so start small and adjust, with sugar and acid added as your jelly recipe directs.
- Sealing method is out of datePouring boiling juice into hot jars and sealing — open-kettle canning — was standard in 1929 but is no longer considered adequate; the vacuum is unreliable and mould or yeast can take hold. Apple extract is high-acid, so process filled jars in a boiling-water bath by current guidelines, or simply refrigerate the extract for a week or freeze it in small containers.
- Five minutes is a starting pointThe 5-minute boil is meant to sterilise and slightly concentrate, not to reduce. If your extract tests weak, keep boiling and retest; long boiling eventually degrades pectin, so concentrate in stages rather than one hard reduction.
Pectin was isolated and named in the 1820s by the French chemist Henri Braconnot, but cooks had been exploiting it unknowingly for centuries by pairing weak-setting fruits with apple or quince, or by adding sour apple juice to a stubborn jelly. Commercial bottled and powdered pectin, extracted largely from apple pomace and later citrus peel, reached American grocers in the 1910s and was well established by the time this book appeared. That a chapter called "The Company Shelf" still teaches the reader to cook down her own extract and jar it says something about how a 1929 household budgeted: the apple trimmings were already in the kitchen, and a bought convenience was a cost to be weighed rather than assumed.