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Dessert

Grape Fruit Marmalade

A preserved citrus spread made by simmering grapefruit, orange, and lemon with water and sugar.

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

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 ↓

Grape Fruit Marmalade

Ingredients

Directions

Prepare the fruit

  1. Shave the grapefruit, orange, and lemon very thin, removing cores and seeds.

  2. Measure the fruit.

  3. Add three times the amount of water.

  4. Let it stand in an earthen bowl overnight.

Cook and set

  1. The next morning, boil for twenty minutes.

  2. Let it stand another night.

  3. On the second morning, add an equal amount of sugar.

  4. Boil until it jellies.

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. Orange + lemontop 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

Grapefruit
Provides the main bitter peel and pulp that give the marmalade its characteristic flavour.
Orange
Adds sweetness and aroma from its peel and juice to balance the grapefruit's bitterness.
Lemon
Adds acidity and pectin-rich pith that helps the marmalade set.
Sugar
Sweetens the marmalade and, with the fruit's pectin and acid, helps it gel when boiled.

The step that matters

Boil until it jellies. Marmalade sets only when enough sugar, pectin and acid are concentrated by boiling. Stopping too early leaves it runny, while boiling too long can make it dark and bitter.

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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