Why it works: White pepper and parsley are a kitchen classic. They rank in the top 5% of all ingredient pairs, and 1,451 recipes mention both. Both carry myrcene, which smells balsamic, herbaceous. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the stock
Wash the cod's head well and place it in a pot with cold water and a little salt.
Boil until sufficiently cooked. Remove the head and set aside the edible parts.
Return the bones to the pot and boil for at least an hour.
Strain the soup through a colander to remove the bones and return the liquid to the pot.
Thicken and finish
Mix a bit of oil into the flour until smooth. Add this to the soup while boiling and stir well.
Add a small piece of butter and the reserved fish pieces. Season with salt and white pepper to taste.
Simmer slowly for about ten minutes. Add minced parsley for extra flavor if desired.
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 aroma chemistry they share, and how many recipes mention both.
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White pepper + parsleytop 5% of all pairsAroma overlapmoderateMentioned together1,451 recipes
Shared aroma: myrcene (balsamic, herbaceous).
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Flour + buttertop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + parsleytop 8% of all pairsAroma overlapmoderateMentioned together28,543 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Flour + parsleytop 9% of all pairsAroma overlapmoderateMentioned together16,513 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + white peppertop 15% of all pairsAroma overlapmoderateMentioned together3,811 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
Flour and butter share little aroma chemistry, yet 122,858 recipes mention both: they likely 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
- Flour
- Thickens the soup into a smoother, heavier body when stirred into boiling liquid.
- Butter
- Adds richness and a silky mouthfeel to the finished broth.
- Cod's head
- Gives the broth its main fish flavor and body as it cooks down.
The step that matters
Adding the flour mixture to the boiling soup. Flour clumps if it hits hot liquid unevenly. Mixing it smooth first and stirring vigorously while adding it lets starch disperse and thicken the soup evenly without lumps.
Flavor stand-ins for the parsley
The recipe marks parsley as optional. How well each one fits the dish's main ingredients (flour, butter, white pepper):
- Nutmegbetter flavor fit
- Parsleythe original
- Maceabout as good a flavor fit
Fit is the average pairing score against flour, butter, white pepper. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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