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Grape Fruit Marmalade

A marmalade made from grapefruit and lemon juice, pulp, rinds, water, and sugar.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Grape Fruit Marmalade

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 ↓

Grape Fruit Marmalade

Ingredients

Directions

Prepare the fruit

  1. Remove the inside sections, white skin, and seeds from the grapefruit and lemon.

  2. Use the juice, pulp, and finely chopped rinds.

Cook the rinds

  1. In a pot, combine the juice, pulp, rinds, and water.

  2. Boil for 30 minutes or longer, starting from when it begins to boil.

  3. Let the mixture stand in a bowl for 24 hours.

Add sugar and finish

  1. Add 1½ pounds of granulated sugar to the mixture.

  2. Boil again for 30 minutes or longer, starting from when it begins to boil.

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.

Photo for illustrative purposes only · Contact us to use it

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

Grapefruit
Provides the bitter peel and pulp that give marmalade its characteristic bitter flavour.
Lemon
Adds acidity and extra pectin-rich pulp that help the marmalade set.
Granulated sugar
Sweetens the marmalade and helps it thicken and set as it boils.

The step that matters

Boiling the rinds before adding sugar. Rinds are tough and need a long boil, and standing for 24 hours lets them soften and release pectin. Adding sugar too early can toughen the peel and hinder that softening, leaving a chewy or poorly set marmalade.

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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