Why it works: Onion and horseradish match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 1,784 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Another Fish Sauce
Ingredients
Directions
Boil the chopped onion, anchovies, and horseradish in stock.
Strain the mixture.
Thicken the strained stock with butter rolled in flour.
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 + horseradishtop 7% of all pairsSmell alikestrongCooked together1,784 recipes
Shared aroma: coumarin (sweet, hay).
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Horseradish + flourtop 10% of all pairsSmell alikestrongCooked together743 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Onion + buttertop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Onion + flourtop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Anchovies
- Add a salty, savory depth that gives the sauce its character.
- Onion
- Adds aromatic sweetness and body as it boils into the stock.
- Horseradish
- Contributes a sharp, pungent aroma that fades with heat.
- Stock
- Forms the liquid base that carries and blends the other flavors.
- Butter
- Adds richness and a rounded, mellow mouthfeel to the finished sauce.
- Flour
- Its starch swells with heat and thickens the strained stock.
The step that matters
Thickening with butter rolled in flour. Flour starch only thickens evenly when it is dispersed in the hot liquid. If the butter and flour lumps are dropped in unbroken, the starch clumps on the outside and stays floury inside.
Swap the horseradish
How well each one fits the dish's main ingredients (onion, butter, flour):
- Chivefits better
- Leekfits better
- Shallotfits better
- Horseradishthe original
Fit is the average pairing score against onion, butter, flour. 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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