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Lemon Filling

A sweet lemon custard used as a filling for pies.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 Filling

Ingredients

Directions

  1. Combine water, part of the sugar, lemon juice, and grated rind in a double boiler.

  2. Heat to boiling.

  3. Mix the remaining sugar with cornstarch and stir into the boiling mixture.

  4. Boil for 10 minutes.

  5. Add the beaten egg and butter.

  6. Beat for a few minutes until well combined.

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. Egg + buttertop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  3. Sugar + buttertop 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

Cornstarch
Thickens the liquid into a smooth, set filling as it boils.
Egg
Adds richness and helps thicken the filling as it cooks.
Sugar
Sweetens the filling and balances the lemon's acidity.
Butter
Adds fat for a smoother, richer texture.
Lemon
Provides acidity and aroma from the juice and grated rind.

The step that matters

Boil for 10 minutes. Cornstarch needs to reach a full boil and hold it to thicken fully and lose its raw starchy taste. Stopping early can leave the filling thin or chalky.

Swap the lemon

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

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

Fit is the average pairing score against sugar, egg, 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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