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Lemon Pie

A lemon custard filling topped with a sweet meringue, baked in a pre‑baked crust.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 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

Make the filling

  1. In a bowl, mix the sugar, lemon juice, and flour.

  2. Add the egg yolks and butter to the mixture.

  3. Slowly stir in the boiling water and cook until thickened, stirring constantly.

Assemble and bake

  1. Pre-bake the pie crusts and pour the hot mixture into them.

  2. Beat the egg whites until stiff, then add 1 tablespoon of sugar and spread over the pie.

  3. Bake until the topping is a delicate brown.

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

Egg yolks
Thicken the filling and add richness as they set with the hot liquid.
Flour
Thickens the lemon filling so it holds its shape when sliced.
Egg whites
Whip into a foam that forms the meringue topping and browns in the oven.
Sugar
Sweetens the filling and helps the meringue whip and turn golden brown.
Lemon juice
Adds acidity that balances the sweetness and gives the filling its tang.

The step that matters

Cook the filling until thickened. The filling must be stirred constantly while cooking so the starch from the flour thickens evenly without lumps or scorching. Undercooked starch will leave the filling runny once cooled.

Swap the lemon

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

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

Fit is the average pairing score against sugar, egg, 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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