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Dessert

Lemon Custard Pie

A tart custard filling made with lemon rind, egg yolk, sugar, flour, and milk, baked in a rich pie crust.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Flour and milk are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 78,219 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓

Lemon Custard 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 the oven to 350°F (175°C).

Make the filling

  1. In a bowl, combine the grated lemon rind, egg (yolk only), sugar, and flour.

  2. Beat the mixture until smooth, then add the milk and mix well.

Bake

  1. Pour the filling into a prepared rich pie crust.

  2. Bake in the preheated oven until set and lightly golden.

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 + milktop 14% of all pairs
    Smell alikelow
    Cooked together78,219 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. Lemon + milktop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

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

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

    Shared aroma: isobutyraldehyde (malty, green).

  5. Lemon + flourtop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

Flour and milk barely smell alike, yet cooks put them together in 78,219 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 yolk
Thickens the custard as it sets and adds richness and a smooth texture.
Milk
Provides the liquid that the egg proteins set into a creamy custard.
Sugar
Sweetens the custard and balances the sharpness of the lemon.
Flour
Stabilises the custard so it holds its shape when sliced.
Lemon rind
Adds bright citrus aroma and flavour from the oils in the zest.

The step that matters

Baking until just set. Egg proteins set as the custard heats; pulling it too late can leave it cracked, watery, or grainy, while underbaking leaves it runny.

Swap the lemon

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

  1. Vanillafits better
  2. Raisinfits better
  3. Figfits better
  4. Lemonthe original

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