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Crayfish Soup or Bisque

A creamy crayfish bisque made by simmering crayfish shells, vegetables, and wine, then thickening with butter and flour.

From an old cookbook · modernised transcription
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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 ↓

Crayfish Soup or Bisque

Ingredients

Directions

Prepare the stock

  1. Wash the crayfish in cold water and place them head first into boiling water.

  2. Add salt, carrot, turnip, onion, parsley, red pepper, and cloves; boil for 20 minutes.

  3. Remove the crayfish and continue boiling the soup.

  4. Once the crayfish are cool enough to handle, break the tails from the bodies and reserve the flesh.

  5. Crush the shells and bodies in a mortar and add them to the soup; boil for 1 hour.

  6. Strain the soup, pressing the solids to extract color and flavor.

Make the bisque

  1. In a separate pot, mix butter and flour over heat until smooth.

  2. Gradually add the strained soup, stirring constantly to avoid lumps.

  3. Add cream and white wine, then stir in the reserved crayfish tails.

  4. Season with salt and cayenne, and serve immediately.

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 + turniptop 1% of all pairs
    Smell alikestrong
    Cooked together8,002 recipes

    Shared aroma: coumarin (sweet, hay).

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

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

  4. Turnip + parsleytop 2% of all pairs
    Smell alikestrong
    Cooked together2,842 recipes

    Shared aroma: coumarin (sweet, hay).

  5. Pepper + clovetop 5% of all pairs
    Smell alikestrong
    Cooked together17,451 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

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

What each ingredient does

Crayfish
Provide the sweet shellfish flavor in the stock and the tender flesh added at the end.
Butter
Enriches the base and carries the flour into a smooth roux for thickening.
Flour
Thickens the soup by swelling in the hot butter to form a roux.
Cream
Adds richness and a smooth, velvety texture to the finished bisque.
White wine
Adds acidity and aromatic brightness that balances the rich cream and butter.
Onion
Builds savory depth in the stock as it simmers with the shells.

The step that matters

Stirring the soup into the roux. Adding liquid to a hot butter and flour mixture all at once causes lumps, because starch granules clump before they hydrate. Adding the soup gradually while stirring constantly lets the starch disperse and thicken evenly.

Swap the onion

How well each one fits the dish's main ingredients (crayfish, carrot, turnip, parsley, pepper, clove, butter):

  1. Parsnipfits better
  2. Leekfits better
  3. Shallotfits better
  4. Onionthe original

Fit is the average pairing score against crayfish, carrot, turnip, parsley, pepper, clove, butter. 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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