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 Jam
Ingredients
Directions
Prepare the apples
Pick over the apples, discarding any bruised ones.
In a clean copper, brass, or enamel pan, add the apples and a little water to prevent burning.
Bring the mixture to a boil and simmer for 15 minutes.
Make the jam
Add the sugar, lemon rind, and lemon juice.
Boil quickly until the juice jells when dropped on a plate.
Jar and store
Pour the jam into jars and cover them carefully.
Store in a dry cupboard.
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 and body, which help the jam set as it cooks.
- Sugar
- Sweetens the jam and helps it gel and keep well.
- Lemon juice
- Adds acidity that brightens flavour and supports pectin setting.
- Lemon rind
- Adds aromatic citrus oil for fragrance and flavour.
The step that matters
Boil quickly until the juice jells. Setting depends on pectin, acid and sugar reaching the right concentration. Overcooking can darken and toughen the jam, while undercooking leaves it runny. Testing by dropping a little on a cold plate shows when it is ready.
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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