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 Jellt
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 until the apples are 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 sugar, rubbing some sugar on a fresh lemon for flavor.
Combine the sugar, juice, and isinglass in a pot.
Boil and skim until the mixture is clear and has turned into jelly.
Jar and cover
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 give the juice its body and set.
- Loaf sugar
- Adds sweetness and helps the juice thicken into a firm, sliceable jelly.
- Isinglass
- Acts as a gelling agent that helps the jelly set firm and clear.
The step that matters
Boiling and skimming the mixture. Boiling must continue until the jelly reaches the setting point; too little boiling leaves it runny, while skimming removes foam so the jelly stays 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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