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 Kidney
Ingredients
Directions
Prepare and fry
Cut the kidney into thin slices.
Flour the slices and fry them until nicely browned.
Pour away the fat from the pan.
Make the gravy and serve
Add butter, boiling water, pepper, salt, and mushroom ketchup to the pan.
Let the gravy boil briefly, then pour it over the kidney and serve.
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.
Photo for illustrative purposes only · Contact us to use it
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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Pepper + mushroomtop 11% of all pairsSmell alikemoderateCooked together13,580 recipes
Shared aroma: 2-nonenal (fatty, green).
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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + ketchuptop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Mushroom + ketchuptop 16% of all pairsSmell alikelowCooked together2,225 recipes
Shared aroma: ethanol (alcoholic, ethereal).
Flour and butter 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
- Kidney
- Is the main protein, cooked quickly so it stays tender when sliced thin.
- Flour
- Coats the slices so they brown well and help thicken the gravy.
- Butter
- Adds richness and flavour to the gravy.
- Mushroom ketchup
- Adds savoury, umami depth to the gravy.
The step that matters
Frying the floured slices until nicely browned. Floured meat browns through the Maillard reaction, which builds savoury flavour and colour. Pale or steamed slices taste flat, and overcrowding the pan causes steaming instead of browning.
“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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