Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Sardine and Egg Curry
Ingredients
Directions
Prepare
Fillet the sardines by cutting them down the back and removing the bones.
Boil the eggs hard, then cut each into quarters or slices.
Make the curry sauce
Melt the butter in a saucepan and fry the onions until golden brown.
Add the curry powder and cook for a few minutes.
Stir in the chopped apple, salt, and lemon juice.
Mix well and add enough stock to create a thick sauce; simmer for 10 minutes.
Serve
Arrange the sardines and quartered eggs on a dish and pour the curry sauce over them.
Serve with boiled rice.
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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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + buttertop 14% of all pairsSmell alikemoderateCooked together8,706 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Butter + saucetop 15% of all pairsSmell alikelowCooked together15,338 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Butter + oniontop 15% of all pairsSmell alikemoderateCooked together42,912 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + lemontop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
Butter and sauce barely smell alike, yet cooks put them together in 15,338 recipes: they work on texture and structure more than aroma.
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Sardines
- Provide the main protein and rich, oily flavour that the curry sauce coats.
- Eggs
- Add body and creamy richness to the dish as a second protein.
- Onions
- Caramelise when fried, building sweetness and a savoury base for the sauce.
- Butter
- Adds fat and richness, carrying the curry powder's aroma into the sauce.
- Apple
- Adds gentle sweetness that balances the spice and savoury sauce.
- Curry powder
- Supplies the main spice aroma and flavour of the sauce when briefly cooked in fat.
The step that matters
Frying the onions until golden brown. Onions cooked slowly in butter develop sweetness and depth through browning. Rushing this step leaves a raw, sharp onion flavour that carries into the whole sauce.
Swap the onion
How well each one fits the dish's main ingredients (apple, butter, lemon, sauce, egg):
- Shallotfits better
- Asparagusfits better
- Capsicumfits better
- Onionthe original
Fit is the average pairing score against apple, butter, lemon, sauce, egg. 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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