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
Grate the apple and the rind of the lemon.
Add the grated apple, lemon juice, lemon rind, sugar, and egg to a pot.
Boil the mixture for about 5 minutes.
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).
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Egg + lemontop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Egg + sugartop 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
- Tart apple
- Provides pectin and acidity that help the mixture thicken as it cooks.
- Egg
- Its proteins set as the mixture heats, helping it thicken into a spreadable jelly.
- Sugar
- Sweetens the jelly and helps it set by binding water and stiffening the mixture.
- Lemon
- Adds acidity and aroma; the acid brightens flavour and supports setting.
The step that matters
Boil the mixture for about 5 minutes. Egg proteins set when heated, so the mixture can curdle or turn grainy if it boils too hard or too long. Keep the heat steady and stir to keep it smooth and thickening evenly.
Swap the apple
How well each one fits the dish's main ingredients (egg, sugar, lemon):
- Orangefits better
- Vanillafits better
- Limefits better
- Applethe original
Fit is the average pairing score against egg, sugar, lemon. 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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