Name: Fried Sheep’s Kidneys with Curry Sauce
Ingredients: 4 sheep's kidneys; 2 tablespoons butter; salt; pepper; 4 tablespoons curry powder; 4 tablespoons flour; 1 cup clear broth; 1 small onion (finely chopped)

Why it works: Pepper and onion are a kitchen classic. They rank in the top 11% of all ingredient pairs, and cooks put them together in 68,474 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Fried Sheep’s Kidneys with Curry Sauce

Ingredients

Directions

Fry the kidneys

Trim the kidneys and cut them into fine pieces.
Melt 2 tablespoons of butter in a frying pan and fry the kidneys until nicely cooked.
Season with salt and pepper.

Make the curry sauce

In a separate saucepan, melt 1 ounce of butter and add 4 tablespoons each of curry powder and flour, along with a moderate amount of salt.
Stir over the heat until mixed, then gradually pour in 1 cup of clear broth, stirring until boiling.
Optionally, add finely chopped onion for flavor.

Serve

Serve the fried kidneys with the curry sauce.

Recipe from a historical cookbook (Internet Archive).

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.

Pepper + oniontop 11% of all pairs

Smell alikemoderate

Cooked together68,474 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Butter + flourtop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

Shared aroma: isobutyraldehyde (malty, green).
Butter + oniontop 15% of all pairs

Smell alikemoderate

Cooked together42,912 recipes

Shared aroma: decanal (soap, orange peel).
Flour + oniontop 17% of all pairs

Smell alikemoderate

Cooked together32,460 recipes

Shared aroma: isobutyraldehyde (malty, green).
Pepper + flourtop 19% of all pairs

Smell alikemoderate

Cooked together50,459 recipes

Shared aroma: isobutyraldehyde (malty, green).

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

Sheep's kidneys: The main protein, which firms and sets as it cooks through in the pan.
Butter: Adds fat for frying and forms the base of the roux, carrying flavor and richness.
Flour: Combined with butter, it thickens the broth into a smooth, coating sauce as it heats.
Curry powder: Supplies the dominant spice flavor and aroma of the sauce.
Clear broth: Forms the liquid of the sauce, which thickens as the flour starch swells on boiling.

The step that matters

Adding the broth to the roux. Pour the broth in gradually while stirring. Adding it all at once can trap flour in lumps, because the starch clumps before it can disperse evenly in the liquid.

Swap the onion

How well each one fits the dish's main ingredients (butter, pepper, flour):

Shallotfits better
Chivefits better
Capsicumfits better
Onionthe original

Fit is the average pairing score against butter, pepper, flour. 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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Fried Sheep’s Kidneys with Curry Sauce