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Dessert

Lemon Jelly Filling

A lemon-flavored filling made by cooking grated rind, juice, sugar, egg, water, flour, and butter.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and flour are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Jelly Filling

Ingredients

Directions

Make the filling

  1. In a saucepan, combine the grated lemon rind, lemon juice, sugar, egg, and water.

  2. Mix the flour with a little water to form a paste and add it to the saucepan.

  3. Cook over medium heat, stirring constantly, until the mixture thickens.

  4. Remove from heat and stir in the butter.

Cool and use

  1. Let cool before placing between layers of cake.

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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Lemon + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

    Shared aroma: 3-hexenal (apple, fruity).

  5. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Butter and flour barely smell alike, yet cooks put them together in 124,287 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

Eggs
Egg thickens the filling as it heats and adds richness to the custard.
Flour
Flour thickens the mixture as it cooks, giving the filling a smooth, spreadable body.
Lemon juice
Lemon juice supplies the sharp acidity that balances the sugar and gives the filling its flavour.
Sugar
Sugar sweetens the filling and balances the sharpness of the lemon.
Butter
Butter stirred in off the heat adds richness and a glossy finish.

The step that matters

Cook until the mixture thickens. Stirring constantly over medium heat keeps the egg and flour from scorching or lumping. The filling must reach a full thickness, since it sets further as it cools.

Swap the lemon

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

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

Fit is the average pairing score against sugar, egg, butter, flour. 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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