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 ↓
Apple Jelly
Ingredients
Directions
Prepare the apple juice
Pare, core, and slice the apples.
Place the apples in a jar with the water.
Cover the jar and place it in a cool oven.
Once the apples are soft, strain the mixture through a jelly bag.
Make the jelly
In a preserving pan, combine the juice with the crushed sugar.
Boil for over 1 hour, removing the scum as it rises.
Add the lemon juice just before finishing.
Pot
Pour the jelly into pots for storage.
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.
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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked 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 pectin, the natural gelling agent that lets the juice set into jelly.
- Loaf sugar
- Adds sweetness and helps the jelly set and keep well in storage.
- Lemon juice
- Adds acidity that supports pectin setting and brightens the flavour.
The step that matters
Boiling and skimming the juice. A long, steady boil concentrates the juice and sugar so the pectin can set. Skimming the scum as it rises removes foam that would otherwise cloud the jelly.
Swap the lemon
How well each one fits the dish's main ingredients (apple, sugar):
- Pearfits better
- Vanillafits better
- Apricotfits better
- 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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