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 Marmalade
Ingredients
Directions
Prepare
Pare, core, and slice the apples.
Weigh the apples and sugar to ensure they are equal.
Make the marmalade
In a preserving kettle, combine the sugar with enough water to make a syrup.
Add the sliced apples, lemon zest, and lemon juice to the syrup.
Once it begins to boil, stir continuously until it thickens into marmalade.
Jar and store
Pour the hot marmalade into jars or tumblers.
Seal tightly and store in a cool place.
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
- Pippin apples
- Provide the fruit base and pectin that help the marmalade thicken as it cooks.
- Loaf sugar
- Sweetens the marmalade and, as it concentrates, helps it set into a thick preserve.
- Lemon juice
- Adds acidity that brightens the flavour and supports pectin set.
- Lemon zest
- Adds aromatic oils that give a fresh citrus fragrance.
The step that matters
Stir continuously once the mixture boils. Sugar and fruit can scorch on the bottom of the kettle if left unstirred, and the mixture must reduce enough for pectin and sugar to set properly.
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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