Why it works: Butter and mushroom are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 12,525 recipes. Both carry trans-2-decenal, which smells waxy, orange. The science ↓
Beef-Steaks and Onions
Ingredients
Directions
Cook the steaks
Season the steaks with pepper and coarse sea salt.
Fry the steaks in butter until done.
Make the onions and sauce
Add sliced onions to the pan and fry until nicely browned.
Place the steaks on a serving dish and top with the fried onions.
In the frying pan, add mushroom ketchup and flour, stirring to thicken.
Let it boil for about one minute, then pour over the steaks.
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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Butter + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Onion + mushroomtop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
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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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Pepper + mushroomtop 11% of all pairsSmell alikemoderateCooked together13,580 recipes
Shared aroma: 2-nonenal (fatty, green).
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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
- Butter
- Fries the steaks and carries flavour and browning from the pan.
- Onions
- Soften and brown in the pan, adding sweetness and savoury depth.
- Flour
- Thickens the pan juices into a smooth sauce as it heats.
- Mushroom ketchup
- Adds a concentrated savoury, umami note to the sauce.
The step that matters
Thickening the sauce with flour. Flour must be stirred into the pan juices and brought to a boil so its starch swells and thickens the sauce. Boiling for about a minute ensures the starch cooks fully, avoiding a raw floury taste and a thin, lumpy sauce.
Swap the onion
How well each one fits the dish's main ingredients (butter, pepper, mushroom, ketchup, flour):
- Shallotfits better
- Capsicumfits better
- Chivefits better
- Onionthe original
Fit is the average pairing score against butter, pepper, mushroom, ketchup, flour. 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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