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Dessert

Filling for Lemon Cake

A lemon-flavored custard-like filling made with lemon juice, rind, sugar, water, egg yolk, and cornstarch.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Lemon and sugar are a kitchen classic. They rank in the top 18% of all ingredient pairs, and cooks put them together in 53,532 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Filling for Lemon Cake

Ingredients

Directions

  1. Dissolve the sugar in the water in a saucepan over medium heat.

  2. Add the lemon juice, grated rind, egg yolk, and cornstarch.

  3. Cook the mixture, stirring, until well mixed and slightly thickened.

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. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  2. Lemon + eggtop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

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

  3. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

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

Lemon and sugar 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

Egg yolk
Adds richness and helps thicken the filling as it cooks.
Cornstarch
Thickens the filling as it heats with the liquid.
Sugar
Sweetens the filling and balances the sharpness of the lemon.
Lemon
Provides acidity and aroma from the juice and grated rind.

The step that matters

Cook the mixture, stirring, until slightly thickened. Cornstarch needs to reach a simmer to thicken fully, but stirring prevents scorching on the pan bottom and keeps the egg yolk from curdling in one spot. Stop once it is thick enough, since overcooking can make the starch break down and thin the filling.

Swap the lemon

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

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

Fit is the average pairing score against 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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