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 the windfall apples and boil them whole in a preserving kettle until pulpy.
Strain the mixture through a jelly bag without squeezing.
Make the jelly
Combine sugar with a little water in a kettle to melt it, then boil quickly for 10 minutes.
Add the strained apple juice to the kettle, using 4 pounds of sugar for every 5 pints of apple juice.
Add the thin rind of 2 lemons and boil all together for 1 hour.
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
- Windfall apples
- Provide pectin and acid, which help the juice set into a firm jelly.
- Sugar
- Sweetens the jelly and helps it set while preserving its texture.
- Lemon rind
- Adds aromatic oils and brightness that balance the sweetness of the jelly.
The step that matters
Boiling the juice with the sugar. The juice and sugar must boil long enough to reach the gel point, where pectin and acid set the jelly. Too little boiling leaves it runny, while overboiling can make it stiff and dark.
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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