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
Stuff the fish with the small onion and tie it in a towel.
Place the fish in a pot and cover it with cold water.
Add coarse sea salt and a little vinegar.
Boil and serve
Heat the water to boiling point.
Boil the fish for 2-3 minutes for large fish, or 1 minute for small fish.
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
- Whole fish
- The main protein; it cooks through quickly in simmering water, becoming firm and flaky.
- Small onion
- Stuffed inside the fish, it adds gentle aroma to the flesh as it cooks.
- Vinegar
- A small amount adds acidity that brightens the flavour of the fish.
The step that matters
Boil the fish for the right time. Fish proteins set quickly and turn dry and tough if overcooked. Timing should match the fish's size, so large and small fish need different durations.
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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