Why it works: Butter and cream match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 41,494 recipes mention both. Both carry delta-dodecalactone, which smells sweet, creamy. 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
Make the stock
Clean and cut the fish into pieces, then place them in a soup pot with the stock and water.
When it boils, add the onion, parsley root, tomatoes, celery, garlic, lettuce, sorrel, mace, and bay leaves.
Let it boil for 1.5 hours, then strain and return to a clean saucepan.
Finish the soup
Mix the flour and butter together, then add to the soup and let it boil for 5 minutes.
In a bowl, mix the eggs and cream, then pour some boiling soup into this mixture and stir.
Pour the entire mixture back into the soup pot.
Fry the bread and serve
Fry the diced bread until golden, drain the fat, and serve with the soup.
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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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Onion + tomatotop 4% of all pairsAroma overlapstrongMentioned together20,622 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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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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Butter + flourtop 6% of all pairsAroma overlaplowMentioned together122,858 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Fish + tomatotop 7% of all pairsAroma overlapstrongMentioned together212 recipes
Shared aroma: 2-nonenal (fatty, green).
Butter and flour share little aroma chemistry, yet 122,858 recipes mention both: they likely 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
- Fish
- Breaks down during long simmering to give the soup its body and flavour.
- Egg yolks
- Thicken the soup and give it a smooth, rich texture when gently heated.
- Butter and flour
- Form a roux that thickens the soup as it boils.
- Cream
- Adds richness and a softer, rounder texture to the finished soup.
- Fried bread
- Adds crisp texture contrasting with the smooth soup.
The step that matters
Adding the egg and cream mixture. Egg yolks can curdle if they meet boiling liquid directly. Warming them first with some hot soup, then returning the mixture to the pot, helps them thicken the soup smoothly.
Flavor stand-ins for the mace
How well each one fits the dish's main ingredients (fish, egg, butter, flour, cream, onion, tomato):
- Garlicbetter flavor fit
- Capersbetter flavor fit
- Parsleybetter flavor fit
- Macethe original
Fit is the average pairing score against fish, egg, butter, flour, cream, onion, tomato. 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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