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
Make the purée
Boil the apples with water until soft.
Rub the apples through a sieve.
Add sugar, lemon juice, and lemon peel to the apple purée.
Set the jelly
Boil isinglass in water until it forms a jelly, then add it to the apple mixture.
Strain the mixture to remove lemon peel and pour it into a mold.
Set the mold in a cool place to firm up.
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 pulp and natural pectin that give the jelly its body.
- Sugar
- Adds sweetness and helps the jelly hold its shape.
- Isinglass
- A gelatin that sets the mixture into a firm jelly as it cools.
- Lemon juice
- Adds acidity that brightens the flavour and supports pectin setting.
The step that matters
Dissolving the isinglass fully. Isinglass is a gelatin that only sets the jelly when it is completely dissolved by heat. If it is not fully melted before it goes into the apple mixture, the jelly may fail to firm up evenly as it cools.
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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