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 gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Make the sauce
Heat the milk in a saucepan and add the mace, bay leaf, parsley, and onion.
Remove the mace, bay leaf, parsley, and onion after the milk has boiled for a moment.
Rub together the butter and flour in a separate bowl, then stir this mixture into the hot milk.
Cook the milk mixture for 2 minutes.
Add the well-beaten egg yolks to the mixture and remove from heat.
Season with salt and pepper to taste.
Assemble and bake
In a baking dish, layer some of the sauce, followed by a layer of fish, then more sauce.
Repeat the layering until all ingredients are used, finishing with a layer of sauce on top.
Sprinkle the top lightly with bread crumbs.
Bake in a 350°F (175°C) oven until hot and nicely browned.
Serve in the same 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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Mace + parsleytop 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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Parsley + oniontop 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
- Eggs
- Egg yolks thicken the sauce and enrich its texture as they set with gentle heat.
- Flour
- Flour mixed with butter thickens the milk into a smooth, stable sauce.
- Milk
- Milk forms the body of the creamy sauce that coats and moistens the fish.
- Cusk fish
- Flaked cooked fish provides the main substance and flavor of the casserole.
- Butter
- Butter adds richness and helps form a smooth roux with the flour.
The step that matters
Adding the egg yolks. Egg yolks can curdle or scramble if the sauce is too hot when they go in. Removing the pan from heat before adding them lets them thicken the sauce gently and evenly.
Flavor stand-ins for the mace
How well each one fits the dish's main ingredients (fish, egg, milk, parsley, onion, butter, flour):
- Nutmegbetter flavor fit
- Thymebetter flavor fit
- Capersbetter flavor fit
- Macethe original
Fit is the average pairing score against fish, egg, milk, parsley, onion, butter, flour. 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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