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 apple syrup
In a pot, combine the clarified sugar and water, and bring to a boil, then skim off any foam.
Add the quartered apples and boil gently until they are tender.
Remove a dozen apple pieces to use as garnish and continue boiling the remaining apples until soft.
Squeeze the juice of three lemons into a bowl.
Pass the cooked apples through a silk sieve into the lemon juice.
Add the isinglass to the mixture and strain it again through the sieve.
Set the jelly
Rinse a mold with cold water and set it in ice if available.
Fill the mold halfway with the jelly and let it set.
Once set, place the reserved apple pieces on top and cover with more jelly.
Fill the mold to the top and let it set completely.
Serve
To serve, turn the jelly out onto a plate and garnish with dried cherries if 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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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 main flavour and body of the jelly, with pectin that helps it thicken.
- Sugar
- Adds sweetness and helps give the jelly its clear, firm body.
- Lemon juice
- Adds acidity that brightens the apple flavour and balances the sweetness.
- Isinglass
- A gelatin-like setting agent that makes the liquid firm into a sliceable jelly.
The step that matters
Strain the mixture before adding the isinglass. Passing the cooked apples through a fine sieve removes pulp and solids so the jelly sets clear and smooth. Isinglass must be dissolved fully and evenly into a hot liquid 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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