Name: Hot Horseradish Sauce
Ingredients: 3 ounces young tender grated horseradish; ½ pint good brown gravy; 1 teaspoon made mustard; 2 teaspoons garlic or eschalot vinegar (or 2 teaspoons chili vinegar, or 4 teaspoons common vinegar); ¼ teaspoon coarse sea salt (to taste); ½ cup thick melted butter (optional)

Why it works: Horseradish and mustard 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 ↓

Hot Horseradish Sauce

Ingredients

3 ounces young tender grated horseradish
½ pint good brown gravy
1 teaspoon made mustard
2 teaspoons garlic or eschalot vinegar (or 2 teaspoons chili vinegar, or 4 teaspoons common vinegar)
¼ teaspoon coarse sea salt (to taste)
½ cup thick melted butter (optional)

Directions

Mix grated horseradish with brown gravy.
Let the mixture stand by the fire until it is nearly boiling.
Add salt, mustard, and vinegar to the mixture.
Optionally, stew the horseradish in vinegar for 10 minutes.
Drain and mix with melted butter.

Recipe from a historical cookbook (Internet Archive).

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.

Horseradish + mustardtop 1% of all pairs

Smell alikestrong

Cooked together1,832 recipes

Shared aroma: coumarin (sweet, hay).
Horseradish + garlictop 5% of all pairs

Smell alikestrong

Cooked together719 recipes

Shared aroma: coumarin (sweet, hay).
Mustard + garlictop 6% of all pairs

Smell alikestrong

Cooked together4,053 recipes

Shared aroma: linalool (floral, citrus).
Garlic + buttertop 22% of all pairs

Smell alikemoderate

Cooked together10,572 recipes

Shared aroma: linalool (floral, citrus).
Mustard + buttertop 22% of all pairs

Smell alikemoderate

Cooked together8,003 recipes

Shared aroma: guaiacol (smoky, sweet).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Horseradish: Provides the sharp, pungent heat that defines the sauce.
Brown gravy: Forms the liquid base and adds savoury depth to the sauce.
Made mustard: Adds sharpness and a mild heat that supports the horseradish.
Vinegar: Adds acidity that brightens the sauce and balances the richness of the gravy.
Melted butter: Adds richness and a smoother, silkier texture to the sauce.

The step that matters

Let the mixture stand by the fire until nearly boiling. Heat releases the volatile compounds that give horseradish its pungency, and gentle warming softens its raw bite. Overheating or boiling too long dulls the sharp flavour and can make the sauce thin or separate once butter is added.

Swap the garlic

How well each one fits the dish's main ingredients (horseradish, mustard, butter):

Capersfits better
Tarragonfits better
Dillfits better
Garlicthe original

Fit is the average pairing score against horseradish, mustard, butter. 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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Hot Horseradish Sauce