Why it works: Vinegar and mustard are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 14,067 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
To Dress Salt Cod or Ling
Ingredients
Directions
Prepare the fish
Soak the salt cod or ling in water with vinegar overnight.
Boil the fish until cooked, then break it into flakes on a serving dish.
Make the parsnip sauce
Boil the parsnips, then beat them in a mortar.
In a pan, combine the beaten parsnips with cream, butter rolled in flour, white pepper, and mustard; boil together.
Serve
Pour the sauce over the fish and serve hot.
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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Vinegar + mustardtop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Cream + buttertop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Flour + mustardtop 13% of all pairsSmell alikemoderateCooked together5,066 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Vinegar + white peppertop 20% of all pairsSmell alikelowCooked together1,154 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
- Salt cod or ling
- Is the main protein, flaked into the dish after soaking and cooking.
- Parsnips (in the method)
- Form the body of the sauce once boiled and beaten smooth.
- Cream
- Adds richness and a smooth, silky texture to the sauce.
- Butter
- Adds fat and richness; rolled in flour, it thickens the sauce as it boils.
- Flour
- Thickens the sauce when rolled with butter and boiled into the cream and parsnips.
The step that matters
Boiling the sauce after adding the floured butter. Flour only thickens properly when it is heated long enough in liquid to swell and cook out its raw taste. Stopping early can leave the sauce thin or floury, while boiling too hard can make cream split.
Swap the white pepper
How well each one fits the dish's main ingredients (vinegar, cream, butter, flour, mustard):
- Capersfits better
- Tarragonfits better
- Nutmegfits better
- White pepperthe original
Fit is the average pairing score against vinegar, cream, butter, flour, mustard. 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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