Why it works: Butter and flour 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
Ingredients
Directions
Prepare the kidneys
Cut the kidneys in half and remove the core.
Place the kidneys in a saucepan without water over medium heat until hot, but do not boil.
After 30 minutes, wash the kidneys in cold water and return them to the saucepan with enough water to cover them.
Boil for one hour, then remove and trim off the fat and skin.
Make the sauce and simmer
In a frying pan, melt some butter, then add pepper, coarse sea salt, and a little flour.
Pour in 2 cups of hot water and add the kidneys.
Let them simmer for 20 minutes, stirring often to prevent drying out.
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.
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Pepper + flourtop 19% of all pairsSmell alikemoderateCooked together50,459 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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
- Kidneys
- Provide the main meat; gentle, moist cooking keeps their texture tender rather than tough.
- Butter
- Adds richness and fat to the pan, carrying flavor into the sauce.
- Flour
- Thickens the cooking liquid into a smoother, more cohesive sauce as it heats.
The step that matters
Keep the kidneys below a boil at the start. High heat makes proteins contract and toughen, so kidneys heated gently to just hot stay more tender than those brought to a rolling boil.
“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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