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 apples
Pare, core, and quarter the apples.
Boil the apples with the lemon rind until tender.
Strain off the apples and run the juice through a jelly bag.
Make the jelly
In a lined saucepan, combine the strained juice, sugar, and isinglass (previously boiled in 1 pint of water).
Boil all together for about 30 minutes.
Pour the jelly into molds and let it set.
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 pectin and fruit flavor that give the jelly its body and taste.
- Loaf sugar
- Adds sweetness and helps the jelly set firm and hold its shape.
- Isinglass
- Gelatin-like protein that sets the liquid into a firm, wobbly jelly when cooled.
The step that matters
Boiling the juice with sugar and isinglass. Boiling for about 30 minutes concentrates the juice and dissolves the sugar fully. Too little boiling leaves the jelly runny, while overboiling can make it tough or cloudy.
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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