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Dessert

Grape Fruit Marmalade

A sweet preserve made from grapefruit, lemon, orange juice, 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: 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 ↓

Grape Fruit Marmalade

Ingredients

Directions

Prepare the fruit

  1. Wash the grapefruit and lemon.

  2. Slice the grapefruit thinly.

  3. Pare off the yellow rind. Cut the skin into four pieces and remove the pith. Shred the rind.

  4. Put the white pith and lemon slices into muslin.

  5. Cut up the grapefruit and remove the seeds.

  6. Combine all ingredients in a basin, add water and orange juice, and leave overnight.

Cook and set

  1. Simmer until thick and pulpy.

  2. Perform a pectin test.

  3. Add sugar.

  4. Boil rapidly until it sets.

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

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

  2. Grape + orangetop 6% of all pairs
    Smell alikemoderate
    Cooked together1,771 recipes

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

  3. Grape + lemontop 14% of all pairs
    Smell alikemoderate
    Cooked together2,412 recipes

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

  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 (in the method)
Provides the bitter peel and pulp that give the marmalade its characteristic flavour and body.
Lemon
Adds acidity and natural pectin to help the marmalade set.
Sugar
Sweetens the marmalade and, with boiling, helps it set into a gel.
Orange juice
Adds sweetness and acidity, balancing the bitterness of the grapefruit.

The step that matters

Boil rapidly until it sets. Sugar must be added before a rapid boil so the pectin, acid and sugar reach the concentration needed to gel. Undercooking leaves it runny; overcooking can make it dark and bitter.

Swap the grape

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

  1. Limefits better
  2. Vanillafits better
  3. Blueberryfits better
  4. Grapethe original

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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