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Dessert

Lemon Pie

A pie with a lemon custard filling and a sweet icing.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Pie

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Make the filling

  1. Combine sugar, flour, and boiling water in a saucepan.

  2. Cook until clear.

  3. Remove from heat, let cool, then stir in the egg yolk.

Bake the crust

  1. Line a pie plate with pastry and bake until golden.

Assemble and brown

  1. Fill the baked crust with the lemon mixture.

  2. Whip the egg white until stiff, then fold in a little sugar for icing.

  3. Spread the icing over the pie and brown in a 350°F (175°C) oven.

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. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Sugar + flourtop 15% of all pairs
    Smell alikemoderate
    Cooked together92,116 recipes

    Shared aroma: phenylacetaldehyde (hawthorne, honey).

  3. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

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

  5. Flour + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and butter barely smell alike, yet cooks put them together in 124,287 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

Sugar
Sweetens the filling and, in the icing, helps the meringue stay stable and sweet.
Flour
Thickens the filling as it cooks, giving it body.
Egg yolk
Adds richness and helps thicken the lemon filling.
Egg white
Whipped to stiff peaks, it forms the light icing that browns on top.
Lemon juice
Adds acidity that brightens the sweet filling.

The step that matters

Cooking the filling until clear. Flour only thickens fully when the starch mixture is cooked long enough to swell and turn clear. Stopping early leaves a pasty, runny filling that will not set properly when cooled.

Swap the lemon

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

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

Fit is the average pairing score against sugar, flour, butter, 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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