Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and 7,551 recipes mention both. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Apple Jelly
Ingredients
Directions
Prepare the juice
Peel and quarter the apples.
Place the apples and lemon peel in a stewpan. Add enough water to cover the apples.
Simmer until the apples are soft.
Strain the mixture through a fine cloth to extract the juice.
Make the jelly
Measure the juice and add an equal amount of sugar.
Boil until it reaches a jelly-like consistency.
Pour into sterilized jars and seal.
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 aroma chemistry they share, and how many recipes mention both.
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Apple + lemontop 14% of all pairsAroma overlapmoderateMentioned together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Apples
- Provide the pectin and tart juice that allow the mixture to set into a jelly.
- Sugar (in the method)
- Adds sweetness and, with boiling, helps the juice thicken and set.
- Lemon peel
- Adds aromatic oils and a bright citrus note to the jelly.
The step that matters
Boil until it reaches a jelly-like consistency. Apple jelly sets only when enough water evaporates and the sugar and pectin reach the right concentration. Undercooking leaves a runny jelly, while overcooking can make it stiff or cause sugar to crystallize.
“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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