Why it works: Parsley and fennel match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 625 recipes. Both carry myristicin, which smells spice, warm. The science ↓
Boiling Fish
Ingredients
Directions
Prepare
Wash the mackerel thoroughly, then soak it in saltwater for 5 minutes.
Boil
Place it in a fish kettle with cold water, barely covering it, and bring to a boil.
Skim the surface.
Cover and simmer gently for 2 to 5 minutes.
Check for doneness by pulling the fins; if they come off easily and the eyes turn white, remove the fish.
Finish and serve
Slit the mackerel open and remove the thin black skin inside.
Serve with parsley and fennel sauce or a sauce made from boiled and mashed soft roes mixed with melted butter.
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.
-
Parsley + fenneltop 1% of all pairsSmell alikestrongCooked together625 recipes
Shared aroma: myristicin (spice, warm).
-
Parsley + minttop 7% of all pairsSmell alikemoderateCooked together1,198 recipes
Shared aroma: 2,4-decadienal (seaweed).
-
Fennel + minttop 7% of all pairsSmell alikemoderateCooked together168 recipes
Shared aroma: beta-phellandrene (minty, terpene).
-
Sauce + roetop 10% of all pairsSmell alikemoderateCooked together142 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Roe + buttertop 14% of all pairsSmell alikelowCooked together442 recipes
Shared aroma: 2,6-nonadienal (cucumber, green).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Mackerel
- Is the main protein; gently poaching it keeps the flesh moist and tender.
- Soft roes
- Mashed and mixed with butter, they give the optional sauce richness and body.
- Butter
- Melted into the roe sauce, it adds richness and a smooth, silky texture.
The step that matters
Simmer gently. A hard boil toughens and breaks up delicate fish flesh. Keeping the water barely simmering cooks the fish evenly and keeps it moist and intact.
Swap the mint
The recipe marks mint as optional. How well each one fits the dish's main ingredients (parsley, fennel, sauce, roe, butter):
- Capersfits better
- Tarragonfits better
- Thymefits better
- Mintthe original
Fit is the average pairing score against parsley, fennel, sauce, roe, butter. 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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