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Kidney Soup

A soup made with beef kidney, onion, water, flour, catsup, pepper, and salt.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Beef and onion are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,092 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Kidney Soup

Ingredients

Directions

Prepare

  1. Wash the kidney well.

Make the soup

  1. In a saucepan, melt a little butter.

  2. Add the kidney and flour, and let them brown.

  3. Add the onion, water, catsup, pepper, and salt.

  4. Cook for 1.5 hours.

  5. Strain before serving.

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.

  1. Beef + oniontop 7% of all pairs
    Smell alikemoderate
    Cooked together17,092 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  2. Beef + peppertop 10% of all pairs
    Smell alikemoderate
    Cooked together18,971 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Onion + peppertop 11% of all pairs
    Smell alikemoderate
    Cooked together68,474 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Flour + buttertop 12% of all pairs
    Smell alikelow
    Cooked together124,287 recipes

    Shared aroma: isobutyraldehyde (malty, green).

  5. Onion + buttertop 15% of all pairs
    Smell alikemoderate
    Cooked together42,912 recipes

    Shared aroma: decanal (soap, orange peel).

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

Beef kidney
Forms the main body of the soup and gives it a rich, meaty flavor as it simmers.
Flour
Browns with the kidney and helps thicken the soup slightly.
Catsup
Adds sweetness and acidity that balance the savory broth.
Onion
Adds aromatic sweetness and depth to the broth as it cooks.

The step that matters

Let the kidney and flour brown. Browning creates Maillard reactions that develop deeper, roasted flavors. Pale searing leaves the broth tasting flat and bland.

Swap the onion

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

  1. Potatofits about as well
  2. Chivefits about as well
  3. Leekfits about as well
  4. Onionthe original

Fit is the average pairing score against beef, flour, pepper, butter. 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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