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
Pare, core, and cut the apples into pieces.
Place the apples in a pot and add enough water to just cover them.
Boil the apples until they are quite soft, then strain the juice through a fine sieve without mashing the fruit.
Make the jelly
For every pint of juice, add 1 pound of loaf sugar.
Rub some sugar on a fresh lemon to flavor the jelly.
Combine the sugar, juice, and isinglass in a pot.
Boil and skim the mixture until it is clear and has turned into jelly.
Jar
Pour the jelly into jars while warm, and cover tightly once cool.
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
- Ripe pippins (apples)
- Provide the fruit and natural pectin that gives the juice its body and set.
- Loaf sugar
- Sweetens the jelly and helps it set firm and hold its shape.
- Isinglass
- Gelling agent that sets the clear juice into a firm, tender jelly.
- Fresh lemon
- Adds acidity and aroma that brighten the flavor of the jelly.
The step that matters
Straining without mashing the fruit. Pressing the cooked apples forces cloudy solids into the juice, which makes the finished jelly cloudy instead of clear.
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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