Why it works: Onion and garlic match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and 29,030 recipes mention both. Both carry furaneol, which smells caramel, strawberry. The science ↓
The recipe
Ingredients
Contains: egg, milk, wheat, fish (auto-detected from the ingredients and method; we can miss things, so check labels)
Also mentioned in the method: egg yolk
Directions
Prepare
Clean and cut the fish into pieces.
Combine the fish, stock, and water in a soup pot.
Bring the mixture to a boil.
Simmer and strain
Add the onion, parsley root, tomatoes, celery, garlic, lettuce, sorrel, mace, and bay leaves.
Boil the soup for 1.5 hours.
Strain the soup and return it to a clean saucepan.
Thicken and serve
Mix the flour and butter together.
Add the flour and butter mixture to the soup.
Boil the soup for 5 minutes.
Mix the egg yolks and cream in a bowl.
Pour some hot soup into the egg yolk mixture and stir.
Pour the mixture back into the soup pot.
Stir the soup well.
Serve with small cubes of fried bread.
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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Onion + garlictop 1% of all pairsAroma overlapstrongMentioned together29,030 recipes
Shared aroma: furaneol (caramel, strawberry).
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Lettuce + sorreltop 1% of all pairsAroma overlapstrongMentioned together317 recipes
Shared aroma: coumarin (sweet, hay).
-
Celery + parsleytop 2% of all pairsAroma overlapstrongMentioned together6,805 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Tomato + garlictop 2% of all pairsAroma overlapmoderateMentioned together14,075 recipes
Shared aroma: furaneol (caramel, strawberry).
-
Tomato + celerytop 3% of all pairsAroma overlapstrongMentioned together3,375 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Fish
- Breaks into tender flakes and gives the soup its main body and savory flavor.
- Flour
- Thickens the soup as it cooks, giving it a smoother, heavier texture.
- Butter
- Adds richness and helps the flour blend smoothly into the soup for thickening.
- Cream
- Adds richness and a silky texture to the finished soup.
- Tomatoes
- Add acidity and fresh flavor that balance the rich fish stock.
The step that matters
Pour some hot soup into the egg yolk mixture and stir. Adding hot liquid gradually tempers the yolks so they warm slowly instead of scrambling. Once they are combined, the soup should not return to a rolling boil, or the yolks may curdle.
Flavor stand-ins for the sorrel
How well each one fits the dish's main ingredients (fish, onion, tomato, celery, garlic, parsley, lettuce):
- Thymebetter flavor fit
- Tarragonbetter flavor fit
- Cuminbetter flavor fit
- Sorrelthe original
Fit is the average pairing score against fish, onion, tomato, celery, garlic, parsley, lettuce. 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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