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Dessert

Lemon Sauce, No. 1

A custard-like sauce made with milk, egg yolk, powdered sugar, lemon juice, lemon rind, and folded egg whites.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Milk and lemon are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 19,053 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓

Lemon Sauce, No. 1

Ingredients

Directions

Make the custard

  1. Scald the milk in a saucepan.

  2. In a bowl, mix the beaten egg yolk with the powdered sugar.

  3. Stir the egg mixture into the scalded milk and cook for 3 minutes, stirring constantly.

  4. Remove from heat and let cool.

Finish and serve

  1. Once cool, stir in the lemon juice and grated lemon rind.

  2. Before serving, fold in the stiffly beaten egg whites.

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. Milk + lemontop 15% of all pairs
    Smell alikemoderate
    Cooked together19,053 recipes

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

  2. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

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

  3. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

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

  4. Milk + sugartop 18% of all pairs
    Smell alikelow
    Cooked together77,875 recipes

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

  5. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

Sugar and lemon 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

Egg yolk
Thickens the milk mixture as it cooks, giving the sauce body.
Egg whites
Whipped and folded in at the end, they lighten the sauce and add airy texture.
Powdered sugar
Sweetens the sauce and dissolves easily into the egg mixture.
Lemon juice
Adds acidity and bright lemon flavour that balances the sweetness.
Lemon rind
Adds fragrant lemon oils for aroma without extra liquid.

The step that matters

Cooking the egg yolk mixture. Egg yolk proteins thicken when heated gently but can scramble if the mixture gets too hot or is left unstirred. Stirring constantly keeps the custard smooth.

Swap the lemon

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

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

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