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
Ingredients
Directions
The book says “a hot oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Soak the halibut in salt water for 2 hours.
Wipe it dry and score the outer skin.
Place the halibut in a dripping pan.
Bake
Bake at 350°F (175°C) for 1 hour.
Baste often with melted butter and heated water.
Check for doneness by inserting a fork; it should penetrate easily and the fish should be brown.
Add boiling water to the pan if needed.
Make the sauce and serve
Stir in walnut ketchup, Worcestershire sauce, and lemon juice.
Thicken the sauce with brown flour mixed with cold water.
Boil the sauce once.
Serve the sauce in a sauce boat.
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.
-
Ketchup + saucetop 1% of all pairsSmell alikestrongCooked together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Walnut + lemontop 10% of all pairsSmell alikestrongCooked together2,149 recipes
Shared aroma: 2-nonenal (fatty, green).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Walnut + flourtop 12% of all pairsSmell alikemoderateCooked together5,873 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
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
- Halibut
- Is the main protein, cooked gently in the oven until flaky and opaque.
- Butter
- Melted butter for basting adds fat and richness and helps the surface brown.
- Brown flour
- Thickens the sauce as it heats with cold water, giving it body.
- Walnut ketchup
- Adds deep savory, tangy flavor to the sauce.
- Lemon juice
- Adds acidity that brightens the sauce and balances its richness.
The step that matters
Checking doneness with a fork. Fish keeps cooking from residual heat and turns dry and tough if overbaked. It should flake and separate easily when the fork goes in, so check before the time runs out.
Swap the lemon
How well each one fits the dish's main ingredients (butter, walnut, ketchup, sauce, flour):
- Raisinfits better
- Avocadofits better
- Lemonthe original
- Coconutfits about as well
Fit is the average pairing score against butter, walnut, ketchup, sauce, flour. 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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