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Dessert

Lemon Jelly Filling

A lemon-flavored jelly used as a cake filling.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Flour and butter 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

Prepare

  1. Grate the yellow zest from the lemons and squeeze out the juice.

  2. In a bowl, mix the sugar and egg yolks.

  3. Add the beaten egg whites and lemon juice to the mixture.

Make the filling

  1. Pour in the boiling water and stir.

  2. In a separate bowl, rub the flour smooth in the water, then add to the mixture.

  3. Stir in the melted butter and cook until thickened.

  4. Let it cool.

Assemble

  1. Spread 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. Flour + buttertop 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).

Flour and butter 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
Yolks and whites thicken and enrich the filling, giving it body and a rich texture.
Sugar
Sweetens the filling and balances the sharpness of the lemon juice.
Lemons
Zest and juice provide the bright lemon aroma and sour acidity.
Flour
Starch thickens the filling as it cooks, giving it a spreadable consistency.
Butter
Adds richness and a smooth, silky mouthfeel to the filling.

The step that matters

Cook until thickened. The flour starch and egg proteins must be heated enough to thicken the mixture. Undercooked filling stays runny and will not hold between cake layers, while overcooking can cause the eggs to curdle.

Swap the lemon

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

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

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