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Dessert

Lemon Pie

A lemon custard pie made with lemon rind, juice, eggs, sugar, flour, butter, and hot water, baked in a crust.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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.

Prepare

  1. Preheat oven to 350°F (175°C).

  2. Prepare the pie crusts and bake them.

Make the custard

  1. In a bowl, mix the grated rind and juice of the lemon with the 3 eggs, saving the whites of 2 eggs.

  2. Add the sugar, flour, and butter to the lemon and egg mixture.

  3. Pour in the hot water and boil until thickened.

Assemble and top

  1. Once the crusts are baked, pour the custard into the crusts.

  2. Beat the reserved egg whites and spread them over the custard.

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. Egg + flourtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  4. Lemon + buttertop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

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

  5. Lemon + flourtop 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

Eggs
Yolks thicken the custard as it sets, and the beaten whites form the topping.
Sugar
Sweetens the filling and balances the sharpness of the lemon.
Lemon
Provides the sharp, aromatic flavor of the filling from its rind and juice.
Flour
Helps thicken the custard so it sets rather than staying runny.
Butter
Adds fat for a richer, smoother custard texture.

The step that matters

Boil the custard until thickened. The filling must reach a full boil to thicken properly; undercooked egg and flour mixtures stay thin and may not set when cooled.

Swap the lemon

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

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

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