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 ↓
Preserved Pippins
Ingredients
Directions
Prepare the apples
Pare and core the pippins.
Place them in a preserving kettle with lemon peel and apple parings.
Add a little water and cover closely.
Boil until tender, being careful not to burn them.
Remove the apples and spread them on a large dish to cool.
Make the syrup
Pour the liquid into a bag and strain it well.
Return the juice to the kettle and add 1 pound of sugar for each pint of juice.
Add lemon juice to taste and boil for 5 minutes, skimming well.
Add the whole apples and boil slowly for 30 minutes or until soft and clear.
Jar and seal
Transfer the apples and juice into jars and let cool completely.
Seal jars with brandy paper.
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).
-
Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Lemon + sugartop 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
- Large pippins (apples)
- Provide the fruit that becomes tender and holds its shape in the syrup.
- Loaf sugar
- Sweetens the juice and helps the apples set clear and firm as the syrup thickens.
- Lemon juice
- Adds acidity that brightens the flavour and helps keep the apples' colour clear.
- Lemon peel
- Contributes aromatic citrus oils that scent the juice during boiling.
The step that matters
Boil the apples slowly. Boiling vigorously can break the apples apart and make the syrup cloudy. A gentle simmer lets them soften evenly while the sugar concentrates and the fruit turns 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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