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
Prepare the tails and palates
Fry the ox tails until pale brown or brown them in a stew pan before adding any liquid.
Add enough broth or water to cover the tails and palates.
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 gravy and finish
In the same stew pan, melt the butter and add enough browned flour to thicken.
Stir in the chopped onion or shallots and cook for a few minutes.
Add the ox tails, season with pepper and salt, and pour in the gravy.
Simmer until well blended.
Before serving, stir in the mustard and ketchup or walnut pickle.
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).
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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 + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
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 rich body that the stew is built around.
- Palates
- Add tender, gelatinous pieces that enrich the stew's texture.
- Browned flour
- Thickens the butter and gravy into a smooth, body-rich sauce.
- Butter
- Adds fat and richness to the gravy base and carries flavour.
- Onion or shallots
- Add savoury aromatic flavour as they soften in the fat.
- Ketchup or walnut pickle
- Adds acidity and tangy sweetness to balance the rich gravy.
The step that matters
Let the gravy cool to remove the fat. Fat from the stewing liquid floats and sets on cooling, so skimming it leaves a cleaner, less greasy gravy before thickening.
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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