Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Savoury Sauce for Roast Pork or Geese
Ingredients
Directions
Make the sauce
Melt the butter in a pint stewpan over medium heat.
Fry the minced onion, stirring often, until it turns light brown.
Add the thickening, mushroom catsup, port wine, warm water, pepper, and salt.
Bring to a boil and simmer for 30 minutes.
Finish and serve
Stir in the mustard and lemon juice or vinegar before serving.
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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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + mushroomtop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Onion
- Frying until light brown adds savory, sweet depth to the sauce.
- Thickening (no. 257)
- Starch that thickens the liquid as it simmers into a smooth sauce.
- Butter
- Fat that carries the onion flavor and adds richness to the sauce.
- Port wine
- Adds sweetness and fruity depth that rounds out the savory base.
- Lemon juice or vinegar
- Acidity that brightens the sauce and balances its richness.
The step that matters
Simmering after adding the thickening. Starch thickens only when it is heated to a boil and simmered, so the sauce must reach a full boil and simmer for the full time to set properly and avoid a thin, floury result.
Swap the lemon
How well each one fits the dish's main ingredients (onion, butter, mushroom, port wine, pepper, mustard):
- Plumfits about as well
- Cherryfits about as well
- Figfits about as well
- Lemonthe original
Fit is the average pairing score against onion, butter, mushroom, port wine, pepper, mustard. 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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