Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Fried Mackerel
Ingredients
Directions
Prepare the fish
Remove heads and tails from the mackerel and split the bodies open to remove the backbones.
Wipe the mackerel dry and season with coarse sea salt, black pepper, and cayenne.
Dust the fish with flour.
Fry and drain
Heat lard in a pan and fry the mackerel until golden brown.
Drain the fried mackerel thoroughly.
Make the sauce
In a small saucepan, melt the butter and mix in the flour, salt, black pepper, and cayenne over gentle heat until lightly colored.
Gradually add the broth or gravy and lemon juice, boiling the sauce for a couple of minutes.
Serve
Serve the sauce hot with the fried mackerel.
For an alternative sauce, mix melted butter with mustard and chili vinegar, and serve with the fish.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Lemon + mustardtop 11% of all pairsSmell alikestrongCooked together3,816 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Mackerel
- Is the main fish, cooked whole-split so the flesh fries through and crisps at the surface.
- Flour
- Dusting forms a thin coating that browns during frying and helps seal in moisture.
- Butter
- Melted with flour to form a roux that thickens the sauce and adds richness.
- Broth or gravy
- Forms the liquid base of the sauce, adding savoury flavour and body.
- Lemon juice
- Adds acidity that brightens the rich sauce and balances the fried fish.
The step that matters
Frying the mackerel until golden brown. Fish dusted with flour needs enough hot lard to crisp the coating quickly; if the fat is too cool, the fish absorbs grease and turns soggy instead of browning.
Swap the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (pepper, flour, butter, lemon, vinegar, sauce):
- Shallotfits better
- Capsicumfits about as well
- Mustardthe original
- Kalefits about as well
Fit is the average pairing score against pepper, flour, butter, lemon, vinegar, sauce. 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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