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Kidney on Toast

Kidney on Toast is a dish of boiled kidney, onion, butter, and cornstarch served over toasted bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

Kidney on Toast

Ingredients

Directions

Prepare

  1. Cut the kidney into large pieces and soak in cold water for 1 hour.

  2. Drain and chop the kidney finely, removing all string and fiber.

  3. Chop the onion separately.

Cook the kidney

  1. Melt the butter in a frying pan, then add the chopped kidney and stir until it turns whitish.

  2. Add the chopped onion and cook for 5 minutes.

  3. Transfer the mixture to a small saucepan, season with salt and pepper, and add the boiling water.

  4. Simmer for 1 hour, then thicken with cornstarch mixed with cold water.

  5. Cook for an additional 5 minutes, then pour over slices of nicely browned toast and serve.

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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

    Shared aroma: delta-decalactone (sweet, creamy).

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

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

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

    Shared aroma: decanal (soap, orange peel).

  4. Onion + breadtop 15% of all pairs
    Smell alikemoderate
    Cooked together8,676 recipes

    Shared aroma: 2,4-decadienal (seaweed).

  5. Bread + peppertop 16% of all pairs
    Smell alikemoderate
    Cooked together20,964 recipes

    Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Kidney
Forms the main meat body of the dish, becoming tender through long simmering.
Onion
Adds savory sweetness and aroma as it softens in the butter.
Butter
Carries the frying flavor and adds richness to the kidney and onion.
Cornstarch
Thickens the cooking liquid into a smooth, glossy sauce when heated.

The step that matters

Thickening with cornstarch. Cornstarch must be mixed with cold water before adding, otherwise it clumps. It thickens only when the liquid is hot enough to swell its starch granules, so the sauce needs to come to a simmer after adding it.

Swap the onion

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

  1. Capsicumfits better
  2. Tomatofits better
  3. Potatofits about as well
  4. Onionthe original

Fit is the average pairing score against butter, bread, pepper. 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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