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Dessert

Lemon Jelly Filling

A lemon-flavored jelly filling made with lemon zest, sugar, eggs, water, flour, and butter.

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. Zest the lemons.

  2. Squeeze out the juice.

Make the filling

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

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

  3. Pour in the boiling water. Stir.

  4. In a separate bowl, mix the flour with ½ cup of water until smooth.

  5. Add the flour mixture to the main mixture.

  6. Stir in the melted butter.

  7. Cook until thickened.

  8. 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 thicken the filling and whites add lightness and body to the mixture.
Sugar
Sweetens the filling and helps give it a smooth, glossy texture.
All-purpose flour
Thickens the filling as it cooks, giving it a spreadable consistency.
Lemons
Provide the bright acidity and aroma that define the filling.
Butter
Adds richness and a smoother mouthfeel to the filling.

The step that matters

Cook until thickened. The starch in the flour and the proteins in the egg yolks must be heated enough to thicken the mixture. Undercooking leaves it runny, while overheating can curdle the eggs or make the filling lumpy.

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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