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 ↓
Jelly, Apple
Ingredients
Directions
The book gives no cooking times; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Make the jelly
In a large pot, combine apple juice and lemon juice.
Bring to a boil over medium heat.
Stir in sugar and pectin, and return to a rolling boil.
Boil for 1 minute, stirring constantly.
Remove from heat and skim off any foam.
Jar and seal
Pour into sterilized jars and seal immediately.
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
- Fruit pectin
- Sets the juice into a gel as it cools after boiling.
- Sugar
- Adds sweetness and helps the pectin form a firm gel.
- Lemon juice
- Adds acidity that helps pectin set properly.
- Apple juice
- Provides the liquid base and the apple flavour of the jelly.
The step that matters
Boil for 1 minute, stirring constantly. Pectin needs a full rolling boil with sugar to set. Stirring prevents scorching on the bottom of the pot, and a shorter or weaker boil can leave the jelly runny.
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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