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Fish Stock

A clear liquid made by simmering fish trimmings, water, carrot, parsley, and onion for several hours.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Carrot and parsley match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 8,053 recipes. Both carry 2,4-decadienal, which smells seaweed. The science ↓

Fish Stock

Ingredients

Directions

  1. Place fish trimmings in a saucepan and cover with water.

  2. Simmer for 2 to 3 hours.

  3. Add carrot, parsley, and onion, then simmer for 1 more hour.

  4. Strain through a coarse strainer.

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. Carrot + parsleytop 1% of all pairs
    Smell alikestrong
    Cooked together8,053 recipes

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

  2. Carrot + oniontop 6% of all pairs
    Smell alikemoderate
    Cooked together21,601 recipes

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

  3. Parsley + oniontop 9% of all pairs
    Smell alikemoderate
    Cooked together25,843 recipes

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

  4. Fish + parsleytop 18% of all pairs
    Smell alikelow
    Cooked together2,341 recipes

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

  5. Fish + oniontop 19% of all pairs
    Smell alikelow
    Cooked together1,924 recipes

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

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

What each ingredient does

Fish trimmings
Provide the bulk of the flavour and gelatin that give the stock body.
Onion
Adds sweetness and savoury depth as it softens during simmering.
Carrot
Contributes gentle sweetness and aroma to the background of the stock.
Parsley
Adds a fresh, herbal aroma that lightens the stock.

The step that matters

Simmer gently rather than boil. A hard boil emulsifies fat and fish oils into the liquid, making the stock cloudy and greasy. Keeping it at a gentle simmer keeps the broth clearer and cleaner-tasting.

Swap the onion

How well each one fits the dish's main ingredients (fish, carrot, parsley):

  1. Parsnipfits better
  2. Turnipfits better
  3. Potatofits better
  4. Onionthe original

Fit is the average pairing score against fish, carrot, parsley. 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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