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
Make the mustard
In a bowl, rub the Durham mustard until smooth.
Gradually add the horseradish vinegar while mixing.
Stir in the salt and cayenne or chili vinegar.
Prepare the horseradish and combine
Pour boiling water over the scraped horseradish and let it sit covered overnight.
Combine the horseradish mixture with the mustard after 1-3 days for best flavor.
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 sharp, pungent base that gives the condiment its characteristic bite.
- Scraped horseradish
- Adds sharp, pungent heat and a clean aroma.
- Horseradish vinegar
- Adds acidity and tang that balances the mustard's sharpness and loosens the paste.
- Cayenne or chili vinegar
- Adds extra heat and a sharp, spicy note.
The step that matters
Timing the combination. Mustard's pungency develops when the ground seed meets liquid and softens as it rests, so combining too early can taste harsh. Resting the horseradish overnight lets its sharp compounds settle before blending.
“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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