Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Broiled Herrings
Ingredients
Directions
Prepare the herrings
Scale and gut the herrings, then cut off the heads.
Wash the herrings clean and dry them with a cloth.
Flour the herrings and broil them.
Make the sauce
Mash the heads and boil them in small beer or ale with whole pepper and an onion for 15 minutes.
Strain the mixture, then thicken it with butter, flour, and mustard.
Serve
Place the broiled herrings on a dish and serve the sauce in a separate boat.
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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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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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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Pepper + oniontop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Beer + mustardtop 11% of all pairsSmell alikemoderateCooked together314 recipes
Shared aroma: guaiacol (smoky, sweet).
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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
- Herrings
- Form the main dish, providing the flesh that is floured and broiled.
- Flour
- Coats the herrings and thickens the sauce, giving body to both.
- Small beer or ale
- Liquid that carries the flavour of the pepper and onion into the sauce.
- Butter
- Adds richness and fat, giving the thickened sauce a smooth, rounded texture.
- Mustard
- Adds sharp, pungent flavour that cuts through the richness of the butter.
The step that matters
Thicken the strained sauce with butter, flour, and mustard. Flour must be cooked into the butter and liquid, or the sauce stays pasty and tastes raw. Mustard added at the end keeps its sharpness, since prolonged boiling dulls it.
Swap the onion
How well each one fits the dish's main ingredients (flour, beer, pepper, butter, mustard):
- Horseradishfits better
- Shallotfits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against flour, beer, pepper, butter, mustard. 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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