Why it works: Pepper and parsley match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 34,122 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
Eel and Tomato Sauce
Ingredients
Directions
Prepare
Prepare and cook the eel as in the previous recipe, then strain the cooking liquid.
Pass the tomatoes through a sieve and mix with ½ cup of the strained liquid.
Make the sauce
In a saucepan, melt the butter, add the flour, and cook for a minute.
Stir in the tomato mixture and season with pepper and salt.
Serve
Pour the sauce over the eel, garnish with parsley, and serve.
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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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,122 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Tomato + peppertop 7% of all pairsAroma overlapmoderateMentioned together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Tomato + parsleytop 8% of all pairsAroma overlapmoderateMentioned together5,398 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 12% of all pairsAroma overlapmoderateMentioned together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 124,287 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
- Tomatoes
- Provide acidity, moisture and body to the sauce once passed through a sieve.
- Flour
- Thickens the sauce as its starch swells in the hot butter and liquid.
- Butter
- Adds fat and richness, and carries the flour into a smooth base.
- Eel
- Main protein, cooked first and served under the tomato sauce.
The step that matters
Cooking the butter and flour for a minute. Cooking the flour in melted butter before adding liquid cooks off its raw taste and lets it thicken evenly without lumps.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (tomato, veal, butter, flour, pepper):
- Parsleythe original
- Thymeabout as good a flavor fit
- Tarragonabout as good a flavor fit
- Sageabout as good a flavor fit
Fit is the average pairing score against tomato, veal, butter, flour, 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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