Why it works: Ketchup and sauce 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 ↓
Veal Kidney Stew
Ingredients
Directions
Prepare and cook the kidneys
Trim the veal kidneys and cut them finely.
In a saucepan, melt the butter over medium heat.
Add the kidneys and cook, stirring occasionally, until lightly colored.
Stir in the flour and cook until slightly browned.
Make the stew
Add the thick strained tomato, tomato ketchup, Worcestershire sauce, and beef stock.
Stir and simmer for 5 minutes.
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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Ketchup + saucetop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Tomato + beeftop 8% of all pairsSmell alikemoderateCooked together5,448 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Veal + beeftop 11% of all pairsSmell alikemoderateCooked together3,784 recipes
Shared aroma: 2,6-nonadienal (cucumber, green).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Flour + ketchuptop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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
- Veal kidneys
- Provide the main meat, which browns lightly and becomes tender in the sauce.
- Butter
- Carries the heat and adds richness while the kidneys begin to color.
- Flour
- Thickens the stew and browns slightly, adding body and a toasty flavour.
- Thick strained tomato
- Adds body, acidity and a bright tomato flavour to the sauce.
- Beef stock
- Supplies the liquid that turns the mixture into a simmering stew.
The step that matters
Stir in the flour and cook until slightly browned. Cooking the flour in fat until it just browns removes raw starch taste and helps it thicken smoothly. Undercooked flour leaves a pasty flavour, while over-browning can make the stew bitter.
Swap the tomato
How well each one fits the dish's main ingredients (veal, butter, flour, ketchup, sauce, beef):
- Shallotfits better
- Onionfits about as well
- Leekfits about as well
- Tomatothe original
Fit is the average pairing score against veal, butter, flour, ketchup, sauce, beef. 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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