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Lemon Custard Pie

A lemon custard pie made with sugar, water, egg yolks, corn starch, lemon peel and juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Corn and lemon are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 1,927 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Lemon Custard Pie

Ingredients

Directions

  1. In a saucepan, combine sugar and hot water.

  2. In a separate bowl, mix egg yolks and corn starch until smooth.

  3. Gradually add the egg mixture to the saucepan, stirring constantly.

  4. Add the grated lemon peel and lemon juice.

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

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. Corn + lemontop 13% of all pairs
    Smell alikemoderate
    Cooked together1,927 recipes

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

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

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

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

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

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

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

  5. Sugar + corntop 21% of all pairs
    Smell alikelow
    Cooked together7,168 recipes

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

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

Egg yolks
Add richness and help set the custard as they thicken with heat.
Corn starch
Thickens the filling as it heats, giving the custard its body.
Sugar
Sweetens the filling and helps balance the sharpness of the lemon.
Lemon juice
Adds acidity and bright lemon flavour to the custard.

The step that matters

Gradually add the egg mixture to the saucepan, stirring constantly. Adding the starch and yolk mixture too quickly or without constant stirring can cause lumps or scramble the yolks before the filling is evenly mixed and thickened.

Swap the lemon

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

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

Fit is the average pairing score against sugar, egg, corn. 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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