Why it works: Potato and mustard are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 1,340 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Boiled Cod
Ingredients
Directions
Prepare
Soak the dried cod in cold water for 3 hours.
Scrape and wash the cod very clean.
Boil and drain
Place the cod in a pot and cover it with cold water.
Boil the cod for 30 minutes.
Drain the cod on a fish dish.
Serve
Serve the cod with mashed potatoes, drawn butter or egg sauce, and hard-boiled eggs.
Provide cayenne pepper, mustard, sweet oil, pepper, vinegar, and catsup on the side.
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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Potato + mustardtop 7% of all pairsSmell alikemoderateCooked together1,340 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Mustard + vinegartop 7% of all pairsSmell alikemoderateCooked together14,067 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + peppertop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + buttertop 13% of all pairsSmell alikemoderateCooked together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Dried cod
- Main protein; soaking rehydrates it so it cooks tender and flakes when boiled.
- Mashed potatoes
- Starchy side that soaks up the mild, savoury flavour of the fish.
- Drawn butter or egg sauce
- Adds richness and moisture to the mild, lean fish.
- Hard-boiled eggs
- Adds richness and a soft, creamy texture alongside the fish.
The step that matters
Boil the cod for 30 minutes. Boiling must be gentle enough to keep the flesh in flakes; a hard boil toughens and breaks the fish apart. Timing matters because overcooking dries out the lean protein.
Swap the potato
How well each one fits the dish's main ingredients (butter, egg, pepper, mustard, vinegar):
- Horseradishfits better
- Shallotfits better
- Capsicumfits better
- Potatothe original
Fit is the average pairing score against butter, egg, pepper, mustard, 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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