Why it works: Sauce and ketchup match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,099 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Stewed Kidneys
Ingredients
Directions
Prepare
Cut the kidneys into small slices, removing all fat and gristle.
Heat a frying pan until very hot.
Add the butter, then the onion, and brown the onion.
Cook
Add the kidneys and dredge them thoroughly with flour.
Cook the kidneys quickly for 5 minutes, stirring constantly.
Add all other ingredients along with the boiling water.
Cook for about 10 minutes.
Finish
Add sherry wine just before serving, if desired.
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.
-
Sauce + ketchuptop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Tomato + peppertop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + tomatotop 8% of all pairsSmell alikemoderateCooked together20,633 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Tomato + winetop 10% of all pairsSmell alikemoderateCooked together2,759 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Kidneys
- Main protein that gives the dish its meaty body and texture.
- Butter
- Fat that carries heat into the pan and helps brown the onion.
- Onion
- Adds aroma and gentle sweetness as it browns.
- Kitchen bouquet
- Browning sauce that deepens the colour of the stew.
The step that matters
Cook the kidneys quickly. Searing over high heat with constant stirring browns the surface and keeps the meat tender. Longer cooking tightens muscle proteins and makes kidney tough and rubbery.
Swap the onion
How well each one fits the dish's main ingredients (butter, sauce, tomato, ketchup, pepper, sherry, wine):
- Capsicumfits better
- Shallotfits about as well
- Carrotfits about as well
- Onionthe original
Fit is the average pairing score against butter, sauce, tomato, ketchup, pepper, sherry, wine. 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.
More stewed kidneys recipes
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.
Tomato Soup526 recipes
Cream of Tomato Soup107 recipes
Tomato Bisque61 recipes
Cream Tomato Soup28 recipes