Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Stewed Kidneys, with Wine
Ingredients
Directions
Prepare the kidneys
Soak the kidneys in cold water, then slice and wipe dry.
Roll the kidneys in flour.
Cook and serve
In a saucepan, heat butter and fry the onion slice.
Add the kidneys and coat them in the butter for 2 minutes.
Pour in boiling water or heated stock and simmer for 10-12 minutes.
Remove the kidneys and place them on a hot dish.
To the gravy, add ketchup, paprika or cayenne, salt, and browned butter.
Boil the gravy, then stir in sherry or claret and pour over the kidneys.
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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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).
-
Butter + sherrytop 14% of all pairsSmell alikemoderateCooked together3,505 recipes
Shared aroma: ethyl octanoate (fruity, wine).
-
Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
-
Flour + oniontop 17% of all pairsSmell alikemoderateCooked together32,460 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Kidneys
- Provide the meat, which is firmed and set by brief cooking in the gravy.
- Flour
- Coats the kidneys and thickens the gravy as it cooks in the liquid.
- Butter
- Adds richness and carries flavour when frying the onion and kidneys.
- Sherry or claret
- Adds acidity and depth to the gravy, stirred in at the end.
The step that matters
Simmer the kidneys for 10-12 minutes. Kidney is tender when cooked briefly; simmering too long toughens the meat and makes it rubbery, so timing matters closely.
Swap the onion
How well each one fits the dish's main ingredients (flour, butter, ketchup, sherry):
- Shallotfits better
- Arrowrootfits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against flour, butter, ketchup, sherry. 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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