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Kidney Toast

A toasted bread square topped with a mixture of ground veal kidney, spices, egg, and breadcrumbs, baked until golden.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 11 ingredients
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Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Kidney Toast

Oven, in the book's wordsA hot oven

Ingredients

Directions

The book says “a hot oven”. The 400°F in the steps is the modern equivalent, not the book's own figure.

Prepare the filling

  1. Pound the cold veal kidney and surrounding fat in a mortar.

  2. Season with salt, pepper, lemon rind, and nutmeg.

  3. Mix with the whisked egg white.

Assemble and bake

  1. Spread the mixture on squares of toast.

  2. Cover the toast with the beaten egg yolk.

  3. Sprinkle the toast with bread crumbs.

  4. Melt the butter in a dish.

  5. Add the toasts to the melted butter.

  6. Bake in a hot oven (400 °F / 200 °C) for 15 minutes.

Serve

  1. Serve hot.

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. Pepper + lemontop 3% of all pairs
    Smell alikestrong
    Cooked together27,047 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Lemon + nutmegtop 5% of all pairs
    Smell alikestrong
    Cooked together11,318 recipes

    Shared aroma: beta-phellandrene (minty, terpene).

  3. Bread + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

  4. Pepper + nutmegtop 7% of all pairs
    Smell alikestrong
    Cooked together13,015 recipes

    Shared aroma: 4'-methylacetophenone (bitter almond).

  5. Egg + breadtop 13% of all pairs
    Smell alikemoderate
    Cooked together22,662 recipes

    Shared aroma: (e)-2-octenal (fatty, green).

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

What each ingredient does

Veal kidney
Provides the main meaty body and rich flavour of the spread.
Egg white
Binds the pounded kidney mixture so it spreads evenly on the toast.
Egg yolk
Enriches the topping and helps it brown in the oven.
Bread crumbs
Add a crisp, browned surface on top of the toast.
Butter
Adds richness and helps the toast brown and crisp as it bakes.

The step that matters

Pound the kidney thoroughly while cold. Pounding the cold kidney and its fat breaks the tissue into a smooth, cohesive paste. If it is not fully broken down, the mixture stays lumpy and will not spread evenly or bind well with the egg white.

Swap the nutmeg

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

  1. Parsleyfits better
  2. Sagefits about as well
  3. Marjoramfits about as well
  4. Nutmegthe original

Fit is the average pairing score against veal, pepper, lemon, egg, bread, 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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