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 ↓
Grapefruit and Orange Marmalade
Ingredients
Directions
Prepare the fruit
Wipe the fruit and squeeze out the juice; reserve the seeds.
Cut the rind into very fine strips.
Put the rind and juice in a kettle, add 11 cups of water, cover, and let stand overnight.
Cover the seeds with 1 cup of water, cover, and let stand overnight.
In the morning, add the water from the seeds to the rind.
Tie the seeds in cheesecloth.
Put the rind and seed water into the kettle.
Cook the rind
Boil uncovered until the rind is very soft and the liquid has reduced to about half.
Remove the seeds after the first hour.
Test the fruit juice for pectin.
Make the marmalade
Add heated sugar and stir until dissolved. Cover.
Heat to boiling.
Boil uncovered for 10 to 20 minutes or until the syrup will jell.
Add lemon juice.
Remove from heat.
Bottle
Pour into sterile bottles.
Seal when cold.
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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Grapefruit + orangetop 1% of all pairsSmell alikestrongCooked together233 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Grapefruit + lemontop 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
- Grapefruit
- Its rind and juice supply the bitter peel and body that give the marmalade its character.
- Orange
- Its rind and juice add aroma, sweetness and bulk to the marmalade.
- Lemon
- Its juice adds acidity and natural pectin that help the marmalade set.
- Sugar
- Sweetens the marmalade and, when boiled to concentration, helps the syrup gel.
The step that matters
Boiling until the syrup will jell. Pectin sets only at the right sugar concentration and acidity. Boiling too briefly leaves the marmalade runny, while overcooking can make it stiff and dull in flavour.
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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