Why it works: Onion and potato are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Stewed Fish
Ingredients
Directions
Prepare the stock
Remove the heads and bones from the fish.
Boil the heads and bones in 3 pints of water for 30 minutes.
Make the sauce
Slice the pork and fry until brown.
Slice the onions and fry them in the pork fat.
Stir in the flour and cook for 3 minutes, stirring constantly.
Pour the strained water from the boiled heads and bones into the onion mixture and simmer for 10 minutes.
Stew and serve
Cut the fish into 3‑inch pieces and season with salt and pepper.
Place the fish in the stew‑pan and pour the sauce over it.
Cover tightly and simmer for 20 minutes.
Taste the sauce and adjust seasoning if necessary.
Garnish with potato balls and parsley.
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.
-
Onion + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Pepper + potatotop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Onion + peppertop 11% of all pairsSmell alikemoderateCooked together68,474 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Fish + buttertop 12% of all pairsSmell alikemoderateCooked together4,488 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour barely smell alike, yet cooks put them together in 124,287 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
- Fish
- Forms the main body of the stew and flakes into tender pieces as it simmers.
- Flour
- Thickens the sauce as it cooks with the fat and onions.
- Onions
- Soften and sweeten as they fry, adding depth to the sauce.
- Pork
- Adds savoury fat and browned flavour to the onions and sauce.
- Butter
- Provides fat for frying and adds richness to the sauce.
The step that matters
Stir in the flour and cook for 3 minutes. Flour must be cooked in the hot fat while stirring constantly; this cooks out its raw taste and lets it thicken the sauce evenly without lumps when the liquid is added.
Swap the onion
How well each one fits the dish's main ingredients (fish, butter, flour, pepper, potato):
- Chivefits better
- Leekfits about as well
- Capsicumfits about as well
- Onionthe original
Fit is the average pairing score against fish, butter, flour, pepper, potato. 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.
You might also like
The 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.
Potato Croquettes255 recipes
Fried Fish120 recipes
Fish Croquettes81 recipes
Potato Rolls78 recipes