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Dessert

Orange Marmalade

A preserve made from orange and lemon rinds, grapefruit pulp, sugar, and water, boiled until soft.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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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

  1. Shave the oranges and lemons as thin as possible.

  2. Add the grapefruit and water, then leave overnight in an enameled kettle.

Cook

  1. Boil for 2 hours or until the rind is very soft.

  2. Add the sugar and boil for 1 hour.

Set

  1. Turn into glasses and leave uncovered until the next day.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Orange + lemontop 1% of all pairs
    Smell alikestrong
    Cooked together10,634 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  2. Orange + grapefruittop 1% of all pairs
    Smell alikestrong
    Cooked together233 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  3. Lemon + grapefruittop 4% of all pairs
    Smell alikestrong
    Cooked together184 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  4. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

  5. Orange + sugartop 20% of all pairs
    Smell alikelow
    Cooked 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
Thin shaved rind supplies pectin and bitter citrus flavor that help the marmalade set.
Lemons
Rind and juice add pectin and acidity that help the marmalade gel and balance the sweetness.
Grapefruit
Pulp and juice add acidity and extra pectin, contributing tartness and helping the set.
Sugar
Sweetens the marmalade and, with pectin and acid, helps it thicken and keep.

The step that matters

Boil the rind until very soft before adding the sugar. Sugar firms up citrus peel, so softening the rind fully first keeps it tender. Adding sugar too early leaves the shreds tough and chewy.

Swap the grapefruit

How well each one fits the dish's main ingredients (orange, lemon, sugar):

  1. Grapefruitthe original
  2. Limefits about as well
  3. Vanillafits less well
  4. 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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