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Exceedingly Fine Apple Jelly

A preserve made by cooking apples with sugar and lemon juice to set into jelly.

From an old cookbook · modernised transcription
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Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Exceedingly Fine Apple Jelly

Ingredients

Directions

Prepare the apples

  1. Pare and slice the apples, removing stalks and seeds, and place them in clean large stone jars.

  2. Dip occasional layers in cold water to preserve color.

  3. Set jars in pans of water and boil slowly until soft.

Extract the juice

  1. Turn the cooked apples into a jelly bag or cloth and let the juice drain.

  2. Weigh the juice and boil it for 10 minutes.

Make the jelly

  1. Stir in 12 oz of sugar for every quart of juice until dissolved.

  2. Return to heat and stir continuously, skimming off any scum, for 8 to 10 minutes.

  3. Add the juice of 2 small lemons and simmer the rind in the juice before adding sugar, if desired.

  4. Pour the jelly into molds and let it set.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Apple + lemontop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Apple + sugartop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

Apple and sugar barely smell alike, yet cooks put them together in 16,478 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Apples
Provide the pectin and natural acid that let the juice gel when cooked with sugar.
Sugar
Sweetens the jelly and, with the cooked juice, helps it set into a firm gel.
Lemon juice
Adds acidity that brightens flavor and supports pectin setting.

The step that matters

Stir in the sugar and boil until setting. Sugar must dissolve fully before the final boil, and the mixture must reach a proper boil while stirred and skimmed. This sets the pectin and sugar balance needed for a firm gel rather than a runny or cloudy result.

Swap the lemon

The recipe marks lemon as optional. How well each one fits the dish's main ingredients (apple, sugar):

  1. Pearfits better
  2. Vanillafits better
  3. Apricotfits better
  4. Lemonthe original

Fit is the average pairing score against apple, sugar. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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