Why it works: Mustard and onion 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 ↓
How to Broil Fish
Ingredients
Directions
Prepare the fish by thoroughly drying and seasoning the insides with coarse sea salt.
Lightly dust the fish with flour to prevent sticking.
Place the fish on a grill or broiler and cook until done.
Serve the fish with the insides facing up, drizzled with melted butter.
For Herring, broil the roes separately to prevent them from falling through the grill.
Optionally, serve with mustard mixed into the melted butter.
For Pilchards, serve with lemon halves and optionally with raw onion pieces.
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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Mustard + oniontop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + lemontop 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).
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Flour + mustardtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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
Swap the mustard
The recipe marks mustard as optional. How well each one fits the dish's main ingredients (flour, butter, lemon, onion):
- Leekfits better
- Shallotfits better
- Okrafits better
- Mustardthe original
Fit is the average pairing score against flour, butter, lemon, onion. Candidates are from the same food group and used in at least 100 recipes.
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