Why it works: Butter and milk match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 81,222 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. 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 cod
Soak and simmer the salt cod for 15 to 20 minutes, then drain and flake it into large pieces.
Make the sauce
In a skillet, melt the butter and sauté the onions until lightly browned, then drain them.
Add the flour to the butter and stir until smooth, then gradually mix in the milk or cream until the sauce thickens to custard consistency.
Reheat the onions in the sauce and season with cayenne pepper.
Fry and serve
Fry the cod flakes in a skillet until lightly browned.
Serve the cod on a hot dish and pour the sauce over it.
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.
-
Butter + milktop 3% of all pairsAroma overlapstrongMentioned together81,222 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Onion + peppertop 6% of all pairsAroma overlapmoderateMentioned together68,463 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + buttertop 7% of all pairsAroma overlapmoderateMentioned together42,827 recipes
Shared aroma: guaiacol (smoky, sweet).
-
Flour + milktop 8% of all pairsAroma overlaplowMentioned together76,993 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Salt cod
- Provides the main flesh, which is flaked and fried for texture and savory flavor.
- Onions
- Soften and brown in butter, adding sweetness and depth to the sauce.
- Butter
- Carries the onions and forms the base of the roux, adding richness.
- Flour
- Thickens the butter and milk into a smooth sauce that sets to custard consistency.
- Milk or cream
- Forms the liquid of the sauce, adding moisture and a creamy body.
The step that matters
Thickening the sauce. Flour must be stirred smooth into the butter before the liquid is added gradually; adding milk too fast causes lumps. The sauce thickens as its starch swells when heated, so it should reach custard consistency before the onions are added.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (butter, flour, milk, pepper):
- Potatobetter flavor fit
- Capsicumbetter flavor fit
- Carrotbetter flavor fit
- Onionthe original
Fit is the average pairing score against butter, flour, milk, 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.
You might also like
Illustration
Illustration
Illustration
IllustrationThe Sunday pairing: one pairing, the chemistry behind it, and how to cook it. No spam, unsubscribe anytime.
Prefer an account? Create a free account for sign-in; Pro adds the full results and chemistry.