Why it works: Orange and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 10,634 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓
Orange Marmalade
Ingredients
Directions
Prepare the fruit
Boil the whole oranges and lemons in soft water with salt for 2 hours.
Boil them in spring water for another 2 hours, ensuring the rinds do not break.
Drain the fruit and let it cool, reserving the last boiling water for syrup.
Cut the fruit in half.
Remove pulp and skins.
Rub the fruit through a fine sieve.
Weigh the fruit and rinds.
Pound the rinds in a mortar.
Make the marmalade
For each pound of fruit, add 2 pounds of sugar and 1 pint of reserved water.
Stir over heat until sugar dissolves.
Cover and bring to a near boil.
Boil gently until scum forms.
Stir in the fruit.
Boil for 30 minutes or until clear.
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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Orange + lemontop 1% of all pairsSmell alikestrongCooked together10,634 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Orange + sugartop 20% of all pairsSmell alikelowCooked together19,212 recipes
Shared aroma: beta-damascenone (apple, rose).
Lemon and sugar barely smell alike, yet cooks put them together in 53,532 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
- Oranges
- Provide the bitter peel and pectin-rich pulp that give marmalade its body and flavour.
- Lemons
- Add extra acidity and pectin, helping the marmalade set and balancing the sweetness.
- Sugar
- Sweetens the marmalade and, when boiled, helps it thicken and set.
The step that matters
Boil until clear and scum forms. Boiling gently skims off impurities that form scum, while the sugar must fully dissolve first so it does not crystallise. Too little or too much heat can leave the marmalade cloudy or overcooked.
“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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