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 ↓
Mustards
Ingredients
Directions
The book gives no cooking times; the times in the steps were added in transcription, so check for doneness rather than trusting the clock.
Prepare
Soak mustard seeds in vinegar for 24 hours.
Grind the soaked seeds to a fine paste.
Season and store
Mix in salt, horseradish, black pepper, and sugar if using.
For a creamier mustard, stir in cream.
Store in a clean jar and refrigerate.
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).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
-
Horseradish + peppertop 11% of all pairsSmell alikemoderateCooked together2,646 recipes
Shared aroma: coumarin (sweet, hay).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Mustard seeds
- Provide the main body and sharp, pungent flavor once ground.
- Vinegar
- Softens the seeds during soaking and adds sharp acidity.
- Horseradish
- Adds sharp, pungent heat that complements the mustard.
- Cream
- Adds richness and a smoother, milder texture when stirred in.
The step that matters
Soaking the seeds for the full 24 hours. The vinegar needs time to soften the seeds so they grind into a smooth paste. A shorter soak leaves the seeds hard, producing a gritty texture and a harsher, less balanced flavor.
Swap the horseradish
How well each one fits the dish's main ingredients (mustard, vinegar, pepper, sugar, brandy, cream):
- Horseradishthe original
- Shallotfits about as well
- Capsicumfits about as well
- Lettucefits less well
Fit is the average pairing score against mustard, vinegar, pepper, sugar, brandy, cream. 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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