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Sauce

Black Butter

A browned butter sauce flavored with onion juice, vinegar, salt, parsley, and black pepper, served over fish.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Parsley and pepper match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 34,122 recipes. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓

Black Butter

Ingredients

Directions

Make the sauce

  1. In a small pan, heat the butter until it browns.

  2. Add the onion juice, vinegar, salt, parsley, and black pepper.

  3. Bring the mixture to a boil.

Serve

  1. Serve immediately with fish, pouring it over broiled fish or passing it with fried fish.

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. Parsley + peppertop 2% of all pairs
    Smell alikestrong
    Cooked together34,122 recipes

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

  2. Onion + parsleytop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  3. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Onion + vinegartop 14% of all pairs
    Smell alikemoderate
    Cooked together18,226 recipes

    Shared aroma: acetic acid (sour, vinegar).

  5. Vinegar + peppertop 14% of all pairs
    Smell alikemoderate
    Cooked together27,814 recipes

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

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 rich base of the sauce.
Vinegar
Adds acidity that sharpens the rich, buttery sauce.
Onion juice
Adds a savoury, aromatic onion flavour to the sauce.

The step that matters

Browning the butter. Butter browns quickly once its milk solids toast, and it can turn bitter or burnt in seconds. Watch for a deep golden-brown colour and a nutty smell, then add the other ingredients promptly to stop the cooking.

Swap the onion

How well each one fits the dish's main ingredients (butter, vinegar, parsley, pepper):

  1. Shallotfits better
  2. Capsicumfits better
  3. Carrotfits better
  4. Onionthe original

Fit is the average pairing score against butter, vinegar, parsley, pepper. 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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