Why it works: Milk and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Fresh Mackerel
Ingredients
Directions
Prepare the fish
Roll the cleaned mackerel in a clean cloth.
Soak the mackerel in cold water.
Cook and make the sauce
Bring water to a boil and cook the mackerel for five minutes.
For the parsley sauce, mix the flour with cold milk until smooth.
Add the butter to the flour mixture and heat until thickened.
Serve
Garnish the dish with green parsley.
Serve with stewed gooseberries.
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.
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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + milktop 14% of all pairsSmell alikelowCooked together78,219 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they 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
- Fresh mackerel
- Forms the main body of the dish and supplies the flesh that is cooked and served.
- Flour
- Thickens the milk into a smooth sauce when heated with it.
- Cold milk
- Forms the liquid base of the parsley sauce, which thickens as it heats.
- Butter
- Adds richness and a silky mouthfeel to the thickened sauce.
The step that matters
Mixing the flour with cold milk until smooth. Starch granules clump if they meet heat before being dispersed in cold liquid. Mixing until smooth first lets the starch hydrate evenly, so the sauce thickens without lumps.
Swap the parsley
How well each one fits the dish's main ingredients (flour, milk, butter, egg):
- Nutmegfits better
- Cinnamonfits better
- Capersfits about as well
- Parsleythe original
Fit is the average pairing score against flour, milk, butter, egg. 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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