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Dessert

Grapefruit Marmalade

A preserved citrus spread made from grapefruit, orange, lemon, water, and sugar, boiled and jellied.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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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 ↓

Grapefruit Marmalade

Ingredients

Directions

Prepare the fruit

  1. Scrub the fruit, cut in half, remove seeds and cores, then chop very fine.

  2. Measure the chopped fruit and add 2 cups of cold water for every cup of fruit.

  3. Place in an agate or china vessel and let stand for 24 hours.

Cook and rest

  1. After 24 hours, bring the mixture slowly to a boil on the stove.

  2. Cook for 20 minutes, then set aside for another 24 hours.

Add sugar and set

  1. Measure the mixture again and for every cup of fruit, add 1 cup of sugar, heated in the oven.

  2. Boil the fruit hard for 20 minutes, then add the sugar.

  3. Continue boiling moderately until the mixture jellies on a spoon.

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. 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

Sugar
Sweetens the marmalade and, with the fruit's pectin and acid, helps it set into a jelly.
Grapefruit
Provides the main bitter flavour and the pectin-rich peel and pulp that help the marmalade set.
Lemon
Adds acidity, which supports pectin setting and brightens the flavour.

The step that matters

Cooking until it jellies on a spoon. Pectin sets only when enough sugar and acid are present and the mixture reaches the right concentration. Stopping too early leaves it runny, while cooking too long can make it dark and stiff.

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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