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Orange or Grapefruit Marmalade

A preserved citrus spread made by boiling fruit slices with water and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Grapefruit and lemon match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 184 recipes. Both carry (e,e)-2,4-decadienal, which smells fatty, deep fried. The science ↓

Orange or Grapefruit Marmalade

Ingredients

Directions

Prepare the fruit

  1. Wash the fruit and slice it very thin, leaving the skins on.

  2. Combine the sliced fruit with 3 cups of cold water and let it stand for 24 hours.

Cook and rest

  1. After 24 hours, boil the mixture for 25 minutes.

  2. Let it stand for another 24 hours.

Add sugar and finish

  1. On the third day, measure the fruit juice and add 1 cup of sugar for each cup of juice.

  2. Boil until it reaches the right 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. Grapefruit + lemontop 4% of all pairs
    Smell alikestrong
    Cooked together184 recipes

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

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

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

  3. Grapefruit + sugartop 26% of all pairs
    Smell alikelow
    Cooked together309 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

Sugar
Sweetens the marmalade and, when boiled, helps it thicken and set.
Grapefruit or oranges
Provide the juice and the thinly sliced peel that give marmalade its bitter-sweet flavour and body.
Lemons
Add extra acidity and natural pectin to help the marmalade set.

The step that matters

Boil until it reaches the right consistency. Sugar and pectin set only at a high enough concentration; boiling too briefly leaves the marmalade runny, while overcooking can make it stiff or caramelised.

Swap the grapefruit

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

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

Fit is the average pairing score against 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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