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Sauce

Beurre Noir, or Brown Butter

A butter sauce made by browning butter and adding vinegar, optionally with parsley.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 3 ingredients
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Why it works: Butter and parsley are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 28,563 recipes. Both carry trans-2-hexenal, which smells green, leafy. The science ↓

Beurre Noir, or Brown Butter

Ingredients

Directions

Make the brown butter

  1. Melt the butter in a small saucepan over medium heat.

  2. Allow the butter to brown without burning.

  3. Once browned, let it cool slightly.

Finish the sauce

  1. Heat the vinegar until hot but not boiling, then pour it into the butter.

  2. If using for poached eggs, it's ready to serve.

  3. For fish, add the chopped parsley and heat together.

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 + parsleytop 15% of all pairs
    Smell alikemoderate
    Cooked together28,563 recipes

    Shared aroma: trans-2-hexenal (green, leafy).

  2. Vinegar + parsleytop 16% of all pairs
    Smell alikemoderate
    Cooked together6,477 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  3. Butter + vinegartop 23% of all pairs
    Smell alikemoderate
    Cooked together13,513 recipes

    Shared aroma: isoamyl acetate (banana, pear).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Butter
Browns to give a nutty, toasted flavour and forms the sauce's rich base.
Vinegar
Adds sharp acidity that balances the richness of the browned butter.

The step that matters

Allow the butter to brown without burning. Butter milk solids toast into nutty flavour only within a narrow window. Past that point they scorch, turning the sauce bitter and dark, so watch closely over medium heat.

Swap the parsley

The recipe marks parsley as optional. How well each one fits the dish's main ingredients (butter, vinegar):

  1. Tarragonfits better
  2. Garlicfits about as well
  3. Parsleythe original
  4. Capersfits about as well

Fit is the average pairing score against butter, vinegar. 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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