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
Slice the fruit very thin and remove the seeds.
Weigh the sliced fruit.
For every pound (or 2 cups), add 3 cups of water.
Place the mixture in a crock.
Let it stand for 24 hours.
Boil and rest
After 24 hours, put the crock on the fire.
Boil for 30 minutes.
Return the mixture to the crock.
Let it sit for another 24 hours.
Add sugar and finish
Measure the mixture. For every pint, add 2 1/4 cups of sugar.
Boil the mixture until it slightly jellies.
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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Orange + grapefruittop 1% of all pairsSmell alikestrongCooked together233 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Lemon + grapefruittop 4% of all pairsSmell alikestrongCooked together184 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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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
- Supply the bulk of the fruit, along with peel and pectin that help the marmalade set.
- Lemons
- Add acidity and pectin, which brighten the flavor and help the marmalade gel.
- Grapefruit
- Add pectin and a bitter edge that balances the sweetness of the sugar.
- Sugar
- Provides sweetness and, at high concentration, helps the pectin set into a gel.
The step that matters
Boil the mixture until it slightly jellies. Pectin sets only when enough sugar and acid are present at a high concentration. Stopping too early leaves the marmalade runny, while overcooking makes it stiff and dull.
Swap the grapefruit
How well each one fits the dish's main ingredients (orange, lemon, sugar):
- Grapefruitthe original
- Limefits about as well
- Vanillafits less well
- Blueberryfits less well
Fit is the average pairing score against orange, lemon, 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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