Why it works: Haddock and ketchup share more aroma than cooks usually use. They rank in the top 1% of all ingredient pairs, and cooks put them together in 23 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
To Stxw Haddocks
Ingredients
Directions
Prepare the fish
Remove the heads, tails, and fins from the haddocks and trim them neatly.
Make the stock
Place the haddocks in 3 pints of water with the peppercorns and onion.
Stew slowly for 35 minutes.
Strain the gravy.
Fry and finish
Dredge the fish in flour.
Fry the fish until brown in hot oil.
Return the fish to the stock.
Add cayenne pepper, lemon juice, and ketchup to the stock.
Stew until the gravy reaches a rich consistency.
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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Haddock + ketchuptop 1% of all pairsSmell alikestrongCooked together23 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Pepper + lemontop 3% of all pairsSmell alikestrongCooked together27,047 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Flour + ketchuptop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Haddock
- Forms the main body of the dish, flaking into tender pieces as it stews.
- Flour
- Coats the fish so it browns during frying and thickens the gravy slightly.
- Onion
- Adds savoury depth and sweetness to the stock as it stews.
- Lemon juice
- Adds acidity that brightens the rich gravy.
- Ketchup
- Adds tomato sweetness and acidity, deepening the colour and flavour of the gravy.
The step that matters
Frying the floured fish until brown. Fish is delicate and can break apart or burn if the oil is not hot enough or the pieces are turned too roughly. A light, even flour coat helps it brown and hold its shape before it returns to the stock.
Swap the onion
How well each one fits the dish's main ingredients (haddock, flour, pepper, lemon, ketchup):
- Shallotfits better
- Capsicumfits better
- Spinachfits better
- Onionthe original
Fit is the average pairing score against haddock, flour, pepper, lemon, ketchup. 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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