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Dessert

Grape Fruit Conserve

A preserve made from grapefruit and lemon, sweetened with sugar and set with water.

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

Grape Fruit Conserve

Ingredients

Directions

Prepare the fruit

  1. Slice off the ends of the grapefruit to prevent bitterness.

  2. Remove the seeds and grind the grapefruit through a coarse meat grinder.

  3. Do the same with the lemons, but do not cut off the ends.

Make the preserve

  1. Add three times as much water as the total amount of fruit and let it stand overnight.

  2. Add an equal quantity of sugar and boil until it jells.

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).

  4. Lemon + meattop 28% of all pairs
    Smell alikelow
    Cooked together2,817 recipes

    Shared aroma: 1-octen-3-ol (mushroom, earthy).

  5. Grapefruit + meattop 29% of all pairs
    Smell alikelow
    Cooked together42 recipes

    Shared aroma: methyl butyrate (fruity, apple).

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 fruit bulk, bitterness from the peel, and natural pectin for setting.
Lemons
Adds acidity that brightens flavour and helps the preserve set.
Sugar
Adds sweetness and, with boiling, helps the preserve thicken and keep.
Nut meats
Adds texture and body to the preserve.

The step that matters

Boiling until it jells. Sugar, pectin and acid must reach the set point together. Boiling too briefly leaves the preserve runny, while boiling too long can make it stiff and cause sugar to crystallise.

Swap the grapefruit

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

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

Fit is the average pairing score against lemon, meat, 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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