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Dessert

Rum Jelly

A gelatinous dessert made with rum, sugar, water, egg whites, shells, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Sugar and rum are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 2,908 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

Rum Jelly

Ingredients

Directions

Prepare the liquids

  1. Dissolve the isinglass in water.

  2. Melt the sugar in a pint of water and add the rum.

Clarify and cook

  1. Whisk the egg whites and shells in a saucepan.

  2. Add the isinglass mixture to the egg mixture.

  3. Heat on the stove, stirring until near boiling.

  4. Cover and place heat above and below the saucepan.

  5. When a crust forms, add lemon juice and cover for 1 hour.

Strain and set

  1. Strain the jelly through a cloth.

  2. Pour into a mold and set on ice.

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. Sugar + rumtop 14% of all pairs
    Smell alikelow
    Cooked together2,908 recipes

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

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

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

  3. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  4. Rum + lemontop 19% of all pairs
    Smell alikemoderate
    Cooked together1,341 recipes

    Shared aroma: alpha-pinene (pine, turpentine).

  5. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

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

Isinglass
Fish-derived gelatin that sets the liquid into a firm jelly when chilled.
Egg whites and shells
As they heat, they coagulate and trap impurities, clarifying the jelly into a clear liquid.
Sugar
Adds sweetness and body to the jelly.
Rum
Adds its flavour and aroma to the jelly.
Lemon juice
Adds acidity that brightens the flavour and balances the sweetness.

The step that matters

Heating with the egg mixture until the crust forms. Stirring the egg whites and shells as the mixture heats lets them coagulate and form a crust that traps cloudiness. Heating too hard or stirring after the crust forms can break it up and leave the jelly murky.

Swap the lemon

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

  1. Vanillafits better
  2. Pineapplefits better
  3. Bananafits better
  4. Lemonthe original

Fit is the average pairing score against sugar, rum, egg. 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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