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
Make the apple juice
Boil tart peeled apples in a little water until glutinous.
Strain out the juice.
Make the jelly
Add 1 pound of white sugar to 1 pint of juice.
Flavor to taste.
Boil until it reaches a good jelly consistency.
Pour into tumblers.
Let cool.
Make the apples in syrup
Pare and core small apples without cutting them open.
Place apples and some sliced lemons in enough water to cover.
Boil slowly until tender.
Carefully remove the apples without breaking them.
Make a syrup with ½ pound of white sugar for every pound of apples.
Add lemon slices to the syrup.
Boil slowly until the apples are clear.
Transfer the apples to a deep glass dish.
Dissolve 1 ounce of isinglass in the syrup.
Bring to a boil.
Pour over the apples.
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
- Tart apples
- Provide pectin and tartness that help the juice set into a firm jelly.
- White sugar
- Sweetens and helps the jelly set firm and hold its shape when boiled.
- Isinglass
- Gelatin-like protein that sets the syrup so it holds around the apples.
- Lemons
- Add acidity and aroma, brightening the sweet syrup.
The step that matters
Boil until the jelly reaches a good consistency. Jelly sets because pectin and sugar concentrate as water evaporates. Stopping too early leaves it runny; boiling too long can make it stiff or caramelise the sugar.
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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