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Dessert

Lemon Tarts

A simple lemon custard filling for tarts made with eggs, sugar, flour, water, butter, and lemon zest and juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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 Tarts

Ingredients

Directions

Make the filling

  1. In a saucepan, combine the eggs, sugar, flour, water, butter, lemon rind, and lemon juice.

  2. Boil the mixture until it thickens.

Finish

  1. Allow to cool before filling the tarts.

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. 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

Eggs
Set and thicken the filling as they cook, giving it body.
Flour
Thickens the filling so it holds its shape when cooled.
Butter
Adds richness and a smooth, silky mouthfeel to the filling.
Lemons
Provide the tart acidity and aroma that define the filling.
Sugar
Sweetens the filling and balances the sharpness of the lemon.

The step that matters

Boil the mixture until it thickens. Egg proteins and starch must be heated enough to thicken the filling. Undercooked eggs stay runny, while overheating can curdle the eggs and make the filling grainy.

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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