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Dessert

Lemon Cake Filling

A sweet lemon filling made with butter, sugar, eggs, cornstarch, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and lemon are a kitchen classic. They rank in the top 16% of all ingredient pairs, and cooks put them together in 41,227 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓

Lemon Cake Filling

Ingredients

Directions

Make the filling

  1. In a saucepan, melt the butter over low heat.

  2. Add the sugar and stir until combined.

  3. Whisk in the eggs one at a time.

  4. Stir in the cornstarch and lemon juice.

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

Finish

  1. Spread the filling warm over your 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 + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

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

  2. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Butter + sugartop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

  4. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  5. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

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

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

Eggs
Proteins set during cooking and help thicken the filling into a custard-like texture.
Cornstarch
Swells when heated with liquid, thickening the filling so it holds its shape.
Lemon juice
Provides the sharp, acidic tang that balances the sweetness of the sugar.
Sugar
Adds sweetness and helps soften the set texture of the filling.
Butter
Adds richness and a smooth mouthfeel to the filling.

The step that matters

Cook over medium heat, stirring constantly, until the mixture thickens.. The eggs and cornstarch thicken as they heat, but the eggs can scramble or curdle if the mixture gets too hot or is left unstirred. Constant stirring spreads the heat evenly and keeps the filling smooth.

Swap the lemon

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

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

Fit is the average pairing score against butter, 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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