Why it works: Onion and mustard match in chemistry and in kitchens. They rank in the top 6% of all ingredient pairs, and cooks put them together in 9,259 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Ox-tails and Palates
Ingredients
Directions
Brown the tails
Fry the divided ox tails until they are a fine pale brown, or brown them in the stew pan before adding any liquid.
Add enough broth or water to cover the tails and stew gently until the palates are tender and can be easily peeled.
Remove the palates and let the gravy cool to remove the fat.
Make the stew
In the stew pan, melt the butter and add enough browned flour to thicken, along with the chopped onion or shallots.
Cook this mixture for a few minutes, then add the seasoned meat and gravy.
Simmer until well blended, then stir in the mustard and ketchup or walnut pickle just before serving.
Serve
Serve with toasted bread and garnish with pickles.
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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Onion + mustardtop 6% of all pairsSmell alikestrongCooked together9,259 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + breadtop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Ox tails
- Provide the meat and collagen that give the stew its body and rich flavour as they simmer.
- Butter
- Adds richness and fat that carries flavour through the gravy.
- Browned flour
- Thickens the gravy as it cooks with the fat and liquid.
- Onion or shallots
- Add savoury sweetness and aroma as they soften in the butter.
- Prepared mustard
- Adds sharp, pungent flavour that cuts through the richness of the gravy.
- Ketchup or walnut pickle
- Adds tangy acidity and sweetness that balances the savoury, fatty gravy.
The step that matters
Cooling the gravy to remove the fat. Fat from the tails rises and sets on cooling, so it can be lifted off easily. Skipping this leaves a greasy stew once the gravy is reheated and thickened.
Swap the onion
How well each one fits the dish's main ingredients (butter, flour, pepper, mustard, ketchup, bread):
- Shallotfits better
- Horseradishfits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against butter, flour, pepper, mustard, ketchup, bread. 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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