Why it works: Milk and butter match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 81,222 recipes mention both. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
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 the fish
Remove skin and bones from the fish and flake it.
Make the sauce
In a double boiler, combine milk, mace, onion, parsley, and bay leaf over heat.
Rub together butter and flour, then stir into boiling milk and cook for 3 minutes.
Add the flaked fish and thinned egg yolks, boil for 1 minute, then remove from heat and strain.
Bake and serve
Layer sauce, fish, and more sauce in a baking dish, finishing with a layer of sauce on top.
Sprinkle with bread crumbs and small dots of butter, then bake at 400°F (200°C) until brown.
Serve in the baking 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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Milk + buttertop 3% of all pairsAroma overlapstrongMentioned together81,222 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Fish + buttertop 5% of all pairsAroma overlapstrongMentioned together4,432 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Parsley + macetop 5% of all pairsAroma overlapstrongMentioned together4,268 recipes
Shared aroma: myristicin (spice, warm).
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Fish + milktop 5% of all pairsAroma overlapstrongMentioned together1,417 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
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Onion + parsleytop 6% of all pairsAroma overlapstrongMentioned together25,834 recipes
Shared aroma: coumarin (sweet, hay).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Cusk (in the method)
- Forms the flaked body of the dish, giving it its main texture and substance.
- Egg yolks
- Thicken the sauce and enrich it with richness and a smooth, custard-like body.
- Flour
- Combined with butter to form a roux that thickens the milk into a sauce.
- Milk
- Forms the base of the sauce, providing moisture and a creamy texture.
- Butter
- Adds fat and flavor to the roux and helps the topping brown in the oven.
The step that matters
Adding the egg yolks. Egg yolks thicken when heated but can scramble if the sauce boils too hard. Adding them to the hot sauce off the boil, then removing it from heat promptly, keeps the sauce smooth rather than grainy.
Flavor stand-ins for the mace
How well each one fits the dish's main ingredients (fish, milk, egg, onion, butter, flour, parsley):
- Nutmegbetter flavor fit
- Thymebetter flavor fit
- Capersbetter flavor fit
- Macethe original
Fit is the average pairing score against fish, milk, egg, onion, butter, flour, parsley. 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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