Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 4% of all ingredient pairs, and 9,243 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
Ingredients
Contains: milk, tree nuts (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Mix the port wine, Harvey sauce, walnut pickle, gravy, bruised pickled walnut, butter, and sliced onion in a bowl.
Add mustard, cayenne, and coarse sea salt to taste.
Serve the mixture hot as an accompaniment to stews, hashes, grills, and game.
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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Onion + mustardtop 4% of all pairsAroma overlapstrongMentioned together9,243 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Port wine + buttertop 5% of all pairsAroma overlapstrongMentioned together1,498 recipes
Shared aroma: ethyl octanoate (fruity, wine).
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Port wine + walnuttop 6% of all pairsAroma overlapmoderateMentioned together237 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
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Sauce + mustardtop 6% of all pairsAroma overlapmoderateMentioned together2,120 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Butter + oniontop 7% of all pairsAroma overlapmoderateMentioned together42,827 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
- Port wine
- Adds sweetness and depth of flavour to the sauce base.
- Harvey sauce
- Contributes savoury, tangy richness as the main flavouring.
- Walnut pickle
- Provides sharp, acidic bite and a distinctive tangy flavour.
- Gravy
- Adds meaty body and moisture to thin the sauce into a spoonable consistency.
Flavor stand-ins for the walnut
How well each one fits the dish's main ingredients (port wine, sauce, butter, onion, mustard):
- Beansbetter flavor fit
- Peasabout as good a flavor fit
- Walnutthe original
- Sesameabout as good a flavor fit
Fit is the average pairing score against port wine, sauce, butter, onion, mustard. 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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