Why it works: Sauce and ketchup match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 1,099 recipes mention both. Both carry ethanol, which smells alcoholic, ethereal. The science ↓
The recipe
Ingredients
Contains: milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Remove skin and bones from the cod and break it into large flakes.
Prepare the white sauce as directed.
Make the filling
Stir in the mushroom ketchup, anchovy essence, mustard, salt, and pepper to taste.
Add the cod to the sauce and mix well.
Bake and serve
Transfer the mixture to a well-buttered baking dish.
Lightly cover the surface with breadcrumbs and dot with butter.
Bake at 400°F (200°C) until well browned, about 15 minutes.
Serve directly from the dish.
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 aroma chemistry they share, and how many recipes mention both.
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Sauce + ketchuptop 1% of all pairsAroma overlapstrongMentioned together1,099 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Sauce + anchovytop 2% of all pairsAroma overlapstrongMentioned together2,048 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Ketchup + anchovytop 2% of all pairsAroma overlapstrongMentioned together470 recipes
Shared aroma: ethanol (alcoholic, ethereal).
-
Mushroom + buttertop 3% of all pairsAroma overlapstrongMentioned together12,516 recipes
Shared aroma: trans-2-decenal (waxy, orange).
-
Mustard + peppertop 6% of all pairsAroma overlapmoderateMentioned together15,427 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cod
- Forms the main body of the dish and provides its flaky texture.
- White sauce
- Binds the fish and keeps the filling moist during baking.
- Mushroom ketchup
- Adds savory depth to the sauce.
- Anchovy essence
- Adds a salty, savory note that enriches the flavor.
- Breadcrumbs
- Form a crisp, browned topping in the oven.
The step that matters
Baking until well browned. The breadcrumb and butter topping browns through the Maillard reaction and dry heat. Stopping too early leaves it pale, while overbaking can dry the fish and sauce beneath.
Flavor stand-ins for the mustard
How well each one fits the dish's main ingredients (sauce, mushroom, ketchup, anchovy, butter, pepper):
- Capsicumbetter flavor fit
- Tomatobetter flavor fit
- Shallotbetter flavor fit
- Mustardthe original
Fit is the average pairing score against sauce, mushroom, ketchup, anchovy, butter, pepper. Candidates are from the same food group and used in at least 100 recipes. This compares flavor only: it does not check the job the ingredient does in the dish (bulk, moisture, acidity, structure).
“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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