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Dessert

Crystal Jelly

A gelatin dessert made with lemon juice, sugar, egg whites, and boiled water.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Sugar and lemon are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Crystal Jelly

Ingredients

Directions

Make the jelly

  1. Dissolve the gelatine and sugar in boiling water.

  2. Add the lemon juice and stir until dissolved.

  3. Place in a cool place until it begins to congeal.

Finish and set

  1. Stir in the well-beaten egg whites until thoroughly mixed.

  2. Pour into molds and let stand 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. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  2. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

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

  3. 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

Gelatine
Provides the structure that lets the liquid set into a firm jelly as it cools.
Sugar
Adds sweetness and helps dissolve the gelatine evenly in the hot water.
Lemon juice
Adds acidity that brightens the flavour and balances the sweetness.

The step that matters

Let the jelly begin to congeal before adding the egg whites. Gelatine sets as it cools. If the mixture is still too warm, the whites may deflate and blend unevenly, while if it is too far set, they will not mix in smoothly.

Swap the lemon

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

  1. Vanillafits better
  2. Raisinfits about as well
  3. Lemonthe original
  4. Datesfits less well

Fit is the average pairing score against sugar, 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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