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
Pare and slice the apples.
Combine apples, sugar, lemon juice, and lemon rind in a pot.
Cook
Boil slowly, stirring and mashing until clear.
Finish
Pour into molds.
Soak apples in water to preserve their color.
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
- Cooking apples
- Supply pectin and body, helping the jam thicken and set as it cooks.
- Loaf sugar
- Adds sweetness and helps the jam set while preserving it.
- Lemon juice
- Adds acidity that helps pectin set and brightens the flavor.
- Lemon rind
- Contributes aromatic citrus oils for fragrance and flavor.
The step that matters
Boil slowly, stirring and mashing until clear. The mixture must reduce enough for sugar, acid and pectin to form a gel. Stirring prevents the sugar and fruit from scorching on the bottom of the pot, and mashing breaks the apples down so they set evenly.
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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