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 fish
Clean and dry the herrings, then cut off their heads.
Flour the fish.
Broil the fish.
Make the sauce
Boil the heads in table beer or ale with whole pepper and onion for 15 minutes.
Strain the liquid.
Thicken it with butter and flour.
Mix in the mustard.
Serve
Serve the sauce in a tureen with the broiled herrings.
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).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
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
- Flour
- Coats the fish and thickens the sauce with butter.
- Butter
- Adds richness and body to the thickened sauce.
- Mustard
- Adds sharp, pungent flavour that cuts the richness of the sauce.
- Table beer or ale
- Liquid that carries the flavour of the heads, pepper and onion into the sauce.
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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