Why it works: Ketchup and sauce match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,099 recipes. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
Baked Halibut or Salmon
Ingredients
Directions
The book says “a hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Soak the fish in cold water with a little coarse sea salt for 1 hour.
Preheat the oven to 400°F (200°C).
Place a gridiron over a dripping pan with a little hot water.
Bake
Bake the fish in the hot oven.
Bake small fish for about 30 minutes and large fish for about 1 hour.
Butter the top of the fish just before it is done.
Brown the fish nicely.
Make the sauce and serve
For the sauce, combine the dripping pan gravy with ketchup, pungent sauce, and lemon juice.
Thicken the sauce with brown flour moistened with a little cold water.
Garnish the dish with parsley sprigs and currant jelly.
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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Ketchup + saucetop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Lemon + parsleytop 1% of all pairsSmell alikestrongCooked together14,037 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + parsleytop 12% of all pairsSmell alikemoderateCooked together16,675 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Ketchup + flourtop 13% of all pairsSmell alikemoderateCooked together2,435 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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
- Brown flour
- Thickens the sauce as it heats, giving it body without extra liquid.
- Butter
- Adds fat and richness, and helps the top of the fish brown.
- Lemon juice
- Adds acidity that brightens the sauce and balances the fish's richness.
- Ketchup
- Adds sweetness, tang and savory depth to the sauce.
The step that matters
Butter the top of the fish just before it is done. Adding butter late keeps it from burning while it adds fat and promotes even browning on the surface.
Swap the currant
How well each one fits the dish's main ingredients (salmon, butter, ketchup, sauce, lemon, flour, parsley):
- Limefits better
- Avocadofits better
- Orangefits better
- Currantthe original
Fit is the average pairing score against salmon, butter, ketchup, sauce, lemon, flour, parsley. 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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