Why it works: Mustard and vinegar are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Mustard Sauce
Ingredients
Directions
Melt the butter in a saucepan.
Add the English mustard, French mustard, flour, sugar, egg yolks, salt, and vinegar.
Simmer gently, stirring continuously with a wooden spoon until smooth and creamy.
If the sauce is too thick, add 1 teaspoon of water or vinegar.
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 + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Mustard + flourtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Sugar + vinegartop 15% of all pairsSmell alikemoderateCooked together20,806 recipes
Shared aroma: beta-damascenone (apple, rose).
Flour and butter 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
- Egg yolks
- Emulsify the butter and thicken the sauce as they set gently with heat.
- Butter
- Adds richness and fat that gives the sauce a smooth, silky mouthfeel.
- Flour
- Thickens the sauce so it holds together rather than running thin.
- French mustard
- Provides the main sharp, pungent mustard flavour and some emulsifying help.
The step that matters
Simmer gently while stirring. Egg yolks scramble if the heat is too high or they are left unstirred, leaving a grainy texture. Gentle heat with constant stirring lets the yolks and butter thicken into a smooth, creamy sauce.
Swap the mustard
How well each one fits the dish's main ingredients (flour, sugar, egg, vinegar, butter):
- Shallotfits about as well
- Mustardthe original
- Chivefits about as well
- Cucumberfits about as well
Fit is the average pairing score against flour, sugar, egg, vinegar, 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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