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 ↓
Apples
Ingredients
Directions
Prepare the fruit and syrup
Peel, core, and place the apples in cold water to prevent discoloration.
Weigh the fruit and use half as much sugar.
Place the apples in a pot, pour boiling water over them, and cook slowly until nearly done.
In another pot, boil the sugar with twice the amount of water.
Cook and fill the jars
Transfer the apples to the boiling syrup using a skimmer and add the sliced lemon.
Boil until the apples are tender enough to pierce easily with a straw.
Carefully lift the apples with a silver spoon and fill a heated jar standing in a pan of hot water.
Fill the jar to the brim with syrup, wipe the rim clean, cover immediately, and set aside to cool.
Settle and seal
The next morning, tighten the lids if possible.
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 the fruit body, which softens in syrup while holding its shape when cooked gently.
- Granulated sugar
- Makes the syrup that preserves the fruit and adds sweetness.
- Lemon
- Adds acidity and brightness that balance the sweet syrup.
The step that matters
Boil until tender, not beyond. Heat softens the apple cells so syrup can penetrate and the fruit turns tender. Boiling too long breaks the apples down, so they lose their shape and turn mushy in the jar.
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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