Name: Kidney Toast
Ingredients: 1 cold veal kidney, with some fat; ¼ teaspoon coarse sea salt; 2 egg whites, beaten; 2 egg yolks, beaten; ½ cup bread crumbs; Toast slices

Why it works: Egg and bread are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 22,662 recipes. Both carry (e)-2-octenal, which smells fatty, green. The science ↓

Kidney Toast

Ingredients

Directions

The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare

Cut the cold veal kidney and fat into very small pieces.
Pound the fat with salt in a mortar.

Assemble

Combine the pounded fat with the beaten egg whites.
Heap the mixture onto the toast slices.
Cover with the beaten egg yolks and sprinkle with bread crumbs.

Bake and serve

Bake in a 350°F (175°C) oven until golden.

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.

Egg + breadtop 13% of all pairs

Smell alikemoderate

Cooked together22,662 recipes

Shared aroma: (e)-2-octenal (fatty, green).
Veal + breadtop 17% of all pairs

Smell alikelow

Cooked together3,056 recipes

Shared aroma: cis-3-hexenol (green, grassy).
Veal + eggtop 28% of all pairs

Smell alikelow

Cooked together6,845 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

Veal kidney: Forms the meaty base of the topping and gives the dish its main flavor.
Egg whites: Bind the pounded fat and set when baked, giving the topping structure.
Egg yolks: Add richness and help the top brown as it bakes.
Bread crumbs: Form a crisp, golden layer on top of the topping.
Toast slices: Provide a firm base that holds the topping.

“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.