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 juice
Wash, dry, and slice the apples.
Boil the apples with a little water until soft and pulpy.
Strain the mixture through a fine sieve to collect the juice.
Make the jelly
In a preserving pan, combine the juice and sugar, and boil for 20 minutes, skimming as needed.
If desired, add the juice and rind of 1 lemon for every pint of juice if the apples are not very good.
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
- Apple juice
- Provides the liquid and natural pectin that lets the jelly set.
- Lump sugar
- Sweetens the jelly and helps it set firm and keep well.
- Lemon
- Adds acidity that brightens flavour and supports pectin setting.
The step that matters
Boiling the juice and sugar for 20 minutes. Boiling concentrates the mixture until sugar and pectin reach the proportions needed to gel. Under-boiling leaves a runny jelly, while over-boiling can darken the colour and dull the flavour.
Swap the lemon
The recipe marks lemon as optional. 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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