Why it works: Mustard and capers match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 624 recipes. Both carry coumarin, which smells sweet, hay. The science ↓
Grill Sauce
Ingredients
Directions
Make the sauce
In a saucepan, combine the gravy, butter, and flour, rubbing them together until smooth.
Add the mushroom or walnut ketchup, lemon juice, mustard, capers, black pepper, grated lemon rind, essence of anchovies, and eschalot wine or minced eschalot.
Stir in the chili vinegar or cayenne.
Simmer the mixture for a few minutes.
Serve
Pour some sauce over the grilled dish and serve the rest in a sauce-tureen.
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 + caperstop 1% of all pairsSmell alikestrongCooked together624 recipes
Shared aroma: coumarin (sweet, hay).
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Lemon + peppertop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Lemon + caperstop 5% of all pairsSmell alikestrongCooked together1,222 recipes
Shared aroma: coumarin (sweet, hay).
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Flour + caperstop 6% of all pairsSmell alikestrongCooked together1,024 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Gravy
- Forms the liquid base of the sauce and carries the other flavours.
- Butter
- Adds richness and a smooth, glossy mouthfeel to the sauce.
- Flour
- Thickens the sauce as it simmers, giving it body.
- Mushroom or walnut ketchup
- Adds deep, savoury umami flavour.
- Lemon juice
- Adds acidity that brightens the sauce and balances richness.
- Mustard
- Adds sharpness and a pungent, savoury bite.
The step that matters
Rubbing the butter and flour into the gravy until smooth. Flour clumps if it is not fully dispersed in fat and liquid. Working the butter and flour together first lets the starch hydrate evenly during simmering, so the sauce thickens smoothly instead of turning lumpy.
Swap the lemon
How well each one fits the dish's main ingredients (butter, flour, mushroom, mustard, capers, pepper, wine):
- Lemonthe original
- Avocadofits about as well
- Limefits less well
- Cherryfits less well
Fit is the average pairing score against butter, flour, mushroom, mustard, capers, pepper, wine. 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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