Why it works: Lemon and pepper 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
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare the kidneys
Gently stew the kidneys in a small amount of water until tender.
Remove all skin and gristle, then pound the kidneys with the butter until smooth.
Season and serve
Squeeze a little lemon juice into the mixture and season with cayenne and salt.
Spread the kidney paste on the toast and place the slices in a 400°F (200°C) oven for a few minutes until hot.
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.
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Lemon + peppertop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Sheep's kidneys
- Form the main body of the paste, providing rich flavour and a soft, spreadable texture when pounded.
- Butter
- Adds fat that makes the pounded kidneys smooth and rich, and moistens the paste.
- Lemon
- Adds acidity that brightens the rich, meaty flavour of the kidneys.
The step that matters
Removing all skin and gristle. Skin and gristle stay tough when cooked and would make the paste grainy or chewy instead of smooth. Thorough removal before pounding gives the spread its texture.
“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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