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Sauce

Sauce Hollandaise

A creamy sauce made from butter, flour, boiling water, lemon juice, salt, cayenne, and egg yolk.

From an old cookbook · modernised transcription
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Why it works: Butter and flour 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 ↓

Sauce Hollandaise

Ingredients

Directions

  1. Melt the butter in a saucepan.

  2. Add the flour and mix until smooth.

  3. Pour in the boiling water and stir until thickened.

  4. Add the lemon juice, salt, and cayenne.

  5. Just before removing from heat, stir in the beaten egg yolk.

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. Butter + flourtop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  2. Flour + eggtop 15% of all pairs
    Smell alikelow
    Cooked together106,462 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  3. Butter + lemontop 16% of all pairs
    Smell alikemoderate
    Cooked together41,227 recipes

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

  4. Flour + lemontop 17% of all pairs
    Smell alikemoderate
    Cooked together30,404 recipes

    Shared aroma: isobutyraldehyde (malty, green).

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

    Shared aroma: decanal (soap, orange peel).

Butter and flour 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

Butter
Adds richness and fat, giving the sauce a smooth mouthfeel.
Flour
Thickens the sauce as its starch swells in the hot liquid.
Egg yolk
Emulsifies and thickens the sauce, adding richness and body.
Lemon juice
Adds acidity that brightens the sauce and balances the butter.

The step that matters

Stirring in the egg yolk. Egg yolk thickens by gently coagulating its proteins. If the sauce is too hot when it goes in, the yolk can scramble, so add it just before removing from heat and keep stirring.

Swap the lemon

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

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

Fit is the average pairing score against butter, flour, 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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