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 apples
Pare, core, and cut the apples into small pieces.
Place the apples in a pot with cold water and the lemon peel.
Make the jelly
Boil until the substance is extracted and half the water is evaporated.
Strain the mixture through a sieve.
To the resulting liquid, add the sugar, lemon juice, and egg whites.
Stir until it boils, then skim until clear.
Mold the jelly as desired.
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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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Lemon + eggtop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 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 pectin and fruit flavor that give the jelly its body.
- Egg whites
- Coagulate when heated and collect impurities, clarifying the liquid as it is skimmed.
- Sugar
- Sweetens the jelly and helps it set firm once cooked down.
- Lemon juice
- Adds acidity that brightens flavor and supports gelling.
The step that matters
Skimming until clear. Skimming must be done as the mixture boils so that the coagulated egg white and impurities are lifted off. Removing them early or late leaves the jelly cloudy or off-flavored.
Swap the apple
How well each one fits the dish's main ingredients (lemon, sugar, egg):
- Orangefits better
- Vanillafits better
- Limefits better
- Applethe original
Fit is the average pairing score against lemon, sugar, egg. 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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