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Dessert

Lemon Curd

A sweet, tart lemon preserve made by cooking lemon juice, rinds, sugar, butter, eggs, and arrowroot.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Lemon and arrowroot match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and cooks put them together in 553 recipes. Both carry coumarin, which smells sweet, hay. The science ↓

Lemon Curd

Ingredients

Directions

Make the curd

  1. In a kettle, combine water, sugar, butter, the juice and rinds of 2 lemons.

  2. Boil the mixture, then remove from heat and gradually add the beaten eggs.

  3. Return to heat and bring to a boil again.

  4. Stir in the arrowroot and boil for 5 more minutes.

  5. Add a few drops of acetic acid and mix well.

Store

  1. Transfer to a covered jar and store.

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. Lemon + arrowroottop 4% of all pairs
    Smell alikestrong
    Cooked together553 recipes

    Shared aroma: coumarin (sweet, hay).

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

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

  3. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

  4. Butter + sugartop 17% of all pairs
    Smell alikemoderate
    Cooked together98,233 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Lemon + sugartop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

Lemon and sugar barely smell alike, yet cooks put them together in 53,532 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
Coagulate as they heat, thickening the curd into a spreadable custard.
Arrowroot
Thickens the liquid into a glossy, stable texture when boiled.
Butter
Adds richness and a smooth, silky mouthfeel to the curd.
Lemon juice
Provides the sharp acidity that defines the curd's flavor.
Sugar
Sweetens the curd and balances the tartness of the lemon juice.

The step that matters

Adding the beaten eggs off the heat. Eggs curdle if they meet very hot liquid directly. Removing the mixture from heat before gradually adding the eggs, then returning it to heat, lets them thicken smoothly instead of scrambling.

Swap the arrowroot

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

  1. Asparagusfits better
  2. Leekfits about as well
  3. Shallotfits about as well
  4. Arrowrootthe original

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