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Dessert

Citrus Marmalade

A preserve made from grapefruit, lemon, and orange with water and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and orange 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 ↓

Citrus Marmalade

Ingredients

Directions

Prepare

  1. Slice and chop the grapefruit, lemon, and orange finely.

  2. Measure the chopped fruit and add 3 cups of water for each cup of fruit.

  3. Let the mixture stand overnight.

Cook the marmalade

  1. In the morning, cook the mixture for 15 minutes.

  2. Measure again and add an equal quantity of sugar.

  3. Cook for half an hour or until it reaches a jellied consistency.

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. Lemon + orangetop 1% of all pairs
    Smell alikestrong
    Cooked together10,634 recipes

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

  2. Grapefruit + orangetop 1% of all pairs
    Smell alikestrong
    Cooked together233 recipes

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

  3. Grapefruit + lemontop 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

Lemon
Its acidity and pectin help the marmalade set into a jelly.
Orange
Adds pectin, acidity and aroma from the fruit and peel to help it set.
Grapefruit
Adds pectin and a bitter citrus flavour that balances the sweetness.
Sugar
Sweetens the marmalade and helps it gel and keep well.

The step that matters

Cook until jellied. Sugar, pectin and acid must be concentrated by boiling to set the marmalade. Stopping too early leaves it runny, while cooking too long can make it stiff and sticky.

Swap the grapefruit

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

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

Fit is the average pairing score against lemon, orange, 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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