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Grape Fruit Jelly

A gelatin-based jelly made with grapefruit juice, lemon juice, sugar, and water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 Jelly

Ingredients

Directions

Make the syrup

  1. In a saucepan, combine sugar and water. Boil for three minutes.

  2. Remove from heat and add soaked gelatin.

Flavor and set

  1. Stir in grapefruit juice, lemon juice, and a little salt.

  2. Pour the mixture into molds and refrigerate until set.

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. Sugar + gelatintop 7% of all pairs
    Smell alikemoderate
    Cooked together2,778 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

  3. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

  4. Sugar + grapefruittop 26% of all pairs
    Smell alikelow
    Cooked together309 recipes

    Shared aroma: beta-damascenone (apple, rose).

  5. Gelatin + lemontop 27% of all pairs
    Smell alikelow
    Cooked together1,215 recipes

    Shared aroma: beta-pinene (pine, resin).

Sugar and lemon 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

Gelatin
Forms the gel network that sets the jelly as it cools.
Sugar
Sweetens the jelly and balances the tart citrus juices.
Grapefruit juice
Supplies the main flavor and some acidity.
Lemon juice
Adds acidity that sharpens and brightens the flavor.

The step that matters

Adding the gelatin off the heat. Gelatin loses setting strength when kept at a hard boil, so it is added after removing the pan from heat. Stir until fully dissolved before adding the juices, so no grains remain and the jelly sets evenly.

Swap the grapefruit

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

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

Fit is the average pairing score against sugar, gelatin, lemon. 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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