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 ↓
Beefsteak Fried with Onions
Ingredients
Directions
Prepare and fry
Season the steak with pepper and roll it in flour.
Fry the steak in lard until done, then remove it from the pan.
Make the gravy and serve
Add chopped onion, pepper, salt, water, and a little mustard to the pan.
Cook for a few minutes, then return the steak to the gravy and let it sit briefly.
Serve hot.
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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Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Pepper + oniontop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Flour + mustardtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Steak
- Provides the main protein, which browns in the hot lard and firms as it cooks through.
- Flour
- Coats the steak so it browns in the fat and helps thicken the pan liquids into gravy.
- Onion
- Softens in the pan and adds sweetness and savory depth to the gravy.
- Lard
- Conducts heat for frying and adds richness and browning to the steak.
The step that matters
Return the steak to the gravy and let it sit briefly. The gravy should be thick enough to coat the meat before the steak returns, since flour thickens only once it has been heated in liquid. Letting the steak rest briefly in the gravy lets it absorb flavor and stay warm, while overcooking it in the gravy would toughen it.
Swap the onion
How well each one fits the dish's main ingredients (pepper, flour, mustard):
- Horseradishfits better
- Shallotfits better
- Lettucefits better
- Onionthe original
Fit is the average pairing score against pepper, flour, 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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