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 kidneys in cold water.
Slice kidneys and wipe them dry.
Roll kidneys in flour.
Cook and make the gravy
Heat a little butter in a saucepan.
Fry a slice of onion.
Add kidneys to the saucepan and coat them in butter for 2 minutes.
Pour in 1 cup of boiling water or heated stock and simmer for 10-12 minutes.
Remove kidneys and place them on a hot dish.
To the gravy, add 1 tablespoon catsup, a dash of paprika or cayenne, ¼ teaspoon coarse sea salt, and 1 tablespoon butter rolled in browned flour.
Bring gravy to a boil, then stir in ⅓ cup sherry or claret.
Serve
Pour gravy over kidneys 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.
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.
-
Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
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).
-
Onion + sherrytop 18% of all pairsSmell alikemoderateCooked together2,352 recipes
Shared aroma: acetal (cream, earthy).
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
- The main protein, which is floured and browned before simmering in the gravy.
- Flour
- Coats the kidneys and thickens the gravy as it cooks in the butter.
- Butter
- Adds richness and helps brown the floured kidneys and onion.
- Sherry or claret
- Adds acidity and depth of flavour to the finished gravy.
The step that matters
Coating the kidneys in butter and simmering. Floured kidneys need enough gentle heat and time in the fat to brown slightly and firm up. Simmering too hard or too long can toughen the meat and make the gravy stick or scorch.
Swap the onion
How well each one fits the dish's main ingredients (flour, butter, sherry):
- Shallotfits better
- Arrowrootfits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against flour, butter, 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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