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Perch

A poached perch served with a butter‑flour sauce flavored with parsley, lemon, nutmeg, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 14 ingredients
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Why it works: Parsley and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 14,036 recipes mention both. Both carry beta-phellandrene, which smells minty, terpene. The science ↓

The recipe

Ingredients

Contains: milk, wheat, tree nuts, fish (auto-detected from the ingredients and method; we can miss things, so check labels)

Also mentioned in the method: walnut, fish

Directions

Poach the fish

  1. Fill a saucepan with enough cold water to cover the fish.

  2. Add chives, parsley, pepper, and salt.

  3. Bring the water to a boil.

  4. Wash the perch in lukewarm water to remove slime.

  5. Empty the perch, remove its gills and fins, and scrape it carefully.

  6. Plunge the fish into the boiling water.

  7. Cook until the flesh gives way when pressed, about 10 minutes for small fish and 30 minutes for large fish.

  8. Drain the fish and place it on a folded napkin.

  9. Garnish with curled parsley.

Make the sauce

  1. In a separate pan, mix butter and flour until smooth.

  2. Add milk, chopped parsley, pepper, salt, and nutmeg.

  3. Stir over heat until just about to boil.

  4. Pour the sauce into a tureen.

  5. Add a walnut-sized piece of butter.

  6. Serve hot.

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 aroma chemistry they share, and how many recipes mention both.

  1. Parsley + lemontop 1% of all pairs
    Aroma overlapstrong
    Mentioned together14,036 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  2. Parsley + peppertop 2% of all pairs
    Aroma overlapstrong
    Mentioned together34,118 recipes

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

  3. Pepper + lemontop 2% of all pairs
    Aroma overlapstrong
    Mentioned together27,039 recipes

    Shared aroma: 2-nonenal (fatty, green).

  4. Butter + milktop 3% of all pairs
    Aroma overlapstrong
    Mentioned together81,222 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  5. Parsley + nutmegtop 3% of all pairs
    Aroma overlapstrong
    Mentioned together5,062 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

Perch
Forms the main body of the dish, providing the flaky flesh that is poached and served.
Butter
Enriches the sauce with fat, giving it a smooth, rich mouthfeel.
Flour
Thickens the butter and milk into a smooth, coating sauce.
Milk
Forms the liquid base of the sauce, softening its texture as it heats.
Lemon juice
Adds acidity that brightens the rich butter sauce.

The step that matters

Stir over heat until just about to boil. Flour thickens the milk only as starch granules swell with heat; stirring keeps the sauce smooth and prevents lumps or scorching on the base of the pan.

Flavor stand-ins for the chive

How well each one fits the dish's main ingredients (parsley, pepper, butter, flour, milk, nutmeg, lemon):

  1. Carrotbetter flavor fit
  2. Potatobetter flavor fit
  3. Capsicumbetter flavor fit
  4. Chivethe original

Fit is the average pairing score against parsley, pepper, butter, flour, milk, nutmeg, lemon. 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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