Why it works: Mustard and horseradish match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,832 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Tartar Mustard
Ingredients
Directions
Prepare
Rub the mustard very smooth with the salt.
Gradually wet the mixture with the horseradish vinegar.
Add the cayenne or chili vinegar and mix well.
Infuse and rest
For extra flavor, pour boiling vinegar over the scraped horseradish and let it sit covered overnight.
For best results, let the horseradish mixture stand for two to three days.
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 + horseradishtop 1% of all pairsSmell alikestrongCooked together1,832 recipes
Shared aroma: coumarin (sweet, hay).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Vinegar + horseradishtop 12% of all pairsSmell alikemoderateCooked together2,609 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Durham mustard
- Provides the main pungent body and bulk of the condiment.
- Horseradish vinegar
- Moistens the mustard and adds sharp acidity that carries the heat.
- Scraped horseradish
- Supplies pungent aroma and sharp heat that mellows during resting.
- Cayenne or chili vinegar
- Adds lingering heat and a spicy kick to the mustard.
The step that matters
Rubbing the mustard smooth with the salt. Mustard flour lumps hydrate unevenly if not broken down first, leaving gritty pockets. Salt helps break up the powder and draws out moisture, so working it smooth before adding liquid gives an even texture and consistent heat.
“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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