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Dessert

Lemon Filling

A lemon custard filling for cakes made with lemon juice, rind, egg yolks, sugar, butter, and milk.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Vanilla and milk are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓

Lemon Filling

Ingredients

Directions

Make the filling

  1. In a bowl, mix the lemon juice, grated rind, egg yolks, sugar, and butter.

  2. Cook the mixture in a double boiler until it thickens and becomes spongy.

  3. Allow it to cool as it will thicken further.

Assemble and frost

  1. Spread the filling between cake layers.

  2. For the frosting, beat together the powdered sugar, vanilla, and milk until smooth.

  3. Spread the frosting on top of the 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. Vanilla + milktop 5% of all pairs
    Smell alikemoderate
    Cooked together19,187 recipes

    Shared aroma: ethyl caproate (fruity, apple peel).

  2. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  3. Sugar + vanillatop 8% of all pairs
    Smell alikelow
    Cooked together35,032 recipes

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

  4. Butter + vanillatop 14% of all pairs
    Smell alikemoderate
    Cooked together20,050 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Lemon + vanillatop 15% of all pairs
    Smell alikemoderate
    Cooked together5,961 recipes

    Shared aroma: eucalyptol (eucalyptus, herbal).

Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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

Egg yolks
Thicken the filling as they cook and give it a rich, custard-like body.
Lemon juice
Provides the sharp acidity that defines the filling's lemon flavour.
Butter
Adds fat for a smooth, rich texture in the cooked filling.
Sugar
Sweetens the filling and balances the lemon's acidity.
Powdered sugar
Dissolves easily into the milk and vanilla to form a smooth, spreadable frosting.

The step that matters

Cooking the filling in a double boiler. Egg yolks can curdle or scramble if overheated. Gentle, indirect heat in a double boiler lets the mixture thicken smoothly as the proteins set slowly.

Swap the lemon

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

  1. Figfits better
  2. Peachfits better
  3. Coconutfits better
  4. Lemonthe original

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