Why it works: Onion and vinegar are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 18,226 recipes. Both carry acetic acid, which smells sour, vinegar. The science ↓
To Boil Fish
Ingredients
Directions
Prepare the fish
Scale the fish and remove the insides, fins, gills, and tail.
Wash the fish well, inside and out, and wipe it dry.
Place the onion inside the fish and tie it up in a cloth.
Boil
Cover the fish with cold water, add salt and vinegar, and heat to boiling.
If the fish weighs 2 pounds or less, remove it immediately; for each additional pound, boil for 1 more minute.
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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Onion + vinegartop 14% of all pairsSmell alikemoderateCooked together18,226 recipes
Shared aroma: acetic acid (sour, vinegar).
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Fish + oniontop 19% of all pairsSmell alikelowCooked together1,924 recipes
Shared aroma: 2,4-decadienal (seaweed).
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Fish + vinegartop 26% of all pairsSmell alikelowCooked together1,036 recipes
Shared aroma: acetoin (butter, cream).
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 dish, cooking through gently in the simmering water.
- Onion
- Adds a mild aroma to the fish as it cooks inside the cloth.
The step that matters
Timing the boil by weight. Boiling too long toughens and dries the fish, while removing it too early leaves the flesh undercooked near the bone. Following the weight-based timing keeps the flesh moist and cooked through.
Swap the onion
How well each one fits the dish's main ingredients (fish, vinegar):
- Cucumberfits better
- Mustardfits better
- Horseradishfits better
- Onionthe original
Fit is the average pairing score against fish, vinegar. 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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