Why it works: Pepper and tomato are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 17,923 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Kidney Omelets
Ingredients
Directions
Make the filling
Slice and sauté the kidneys in butter, sprinkling with pepper and salt.
Stir in the tomato purée or Fine Herbs Sauce.
Finish the omelette
When the omelet is nearly cooked, arrange the kidneys on the side farthest from the handle.
Fold the other side over the kidneys and transfer to a serving dish.
Serve with additional Fine Herbs Sauce.
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.
-
Pepper + tomatotop 7% of all pairsSmell alikemoderateCooked together17,923 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Butter + peppertop 21% of all pairsSmell alikemoderateCooked together85,593 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
-
Butter + tomatotop 22% of all pairsSmell alikemoderateCooked together6,918 recipes
Shared aroma: 3-hexenal (apple, fruity).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Sheep's kidneys
- Provide the main savoury filling, with a firm, tender bite when sautéed briefly.
- Butter
- Adds fat for sautéing and a rich, savoury flavour to the kidneys.
- Tomato purée
- Adds acidity, sweetness and body to the filling; can be replaced by Fine Herbs Sauce.
The step that matters
Sautéing the kidneys. Kidneys turn tough and rubbery when overcooked, so they should be sliced thin and cooked briefly over moderate heat until just firm. Overcrowding the pan steams them instead of browning, which dulls their flavour.
Swap the tomato
How well each one fits the dish's main ingredients (butter, pepper):
- Capsicumfits better
- Potatofits better
- Carrotfits about as well
- Tomatothe original
Fit is the average pairing score against butter, 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.
More kidney omelette recipes
You might also like
Rice Gruel28 recipes
Peptoned Milk Gruel9 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.