Why it works: Mustard and onion match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and 9,259 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Piquant Sauce
Ingredients
Directions
Heat the meat stock in a saucepan until boiling and season to taste.
In a separate pan, brown the butter and flour together.
Pour the boiling meat stock over the browned butter and flour mixture.
Stir in the mustard, onion juice, vinegar, and parsley.
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 aroma chemistry they share, and how many recipes mention both.
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Mustard + oniontop 6% of all pairsAroma overlapstrongMentioned together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + vinegartop 7% of all pairsAroma overlapmoderateMentioned together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Mustard + parsleytop 8% of all pairsAroma overlapstrongMentioned together2,588 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Onion + parsleytop 9% of all pairsAroma overlapmoderateMentioned together25,843 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Butter + flourtop 12% of all pairsAroma overlaplowMentioned together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour share little aroma chemistry, yet 124,287 recipes mention both: they likely 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
- Butter
- Browns with the flour to add a nutty, rich flavour and fat to the sauce.
- Flour
- Thickens the sauce when cooked with the butter and combined with the hot stock.
- Meat stock
- Forms the liquid base of the sauce, carrying the other flavours.
- Vinegar
- Adds acidity that sharpens the sauce and balances its richness.
- Prepared mustard
- Contributes sharp, pungent flavour that gives the sauce its piquancy.
The step that matters
Pour the boiling stock over the browned butter and flour. The stock must be boiling hot so the starch in the flour swells and thickens the sauce smoothly. Adding cool liquid to the roux can leave lumps that are hard to remove.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (meat, butter, flour, mustard, onion, vinegar):
- Capersbetter flavor fit
- Garlicbetter flavor fit
- Tarragonbetter flavor fit
- Parsleythe original
Fit is the average pairing score against meat, butter, flour, mustard, onion, vinegar. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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