Why it works: Onion and leek match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 1,326 recipes mention both. Both carry ethyl butyrate, which smells apple, fruity. The science ↓
The recipe
Ingredients
Contains: egg (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare and simmer
Tie the veal shank and place it in a pot with veal trimmings, sliced onions, leeks, and a bouquet of parsley.
Cover with good broth and simmer, skimming frequently with fresh water until the meat is very tender.
Clarify and strain
Strain the mixture through a damp cloth and clarify by adding a well-beaten egg white.
Strain again to finish.
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 + leektop 3% of all pairsAroma overlapstrongMentioned together1,326 recipes
Shared aroma: ethyl butyrate (apple, fruity).
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Leek + parsleytop 5% of all pairsAroma overlapstrongMentioned together759 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Onion + parsleytop 6% of all pairsAroma overlapstrongMentioned together25,834 recipes
Shared aroma: coumarin (sweet, hay).
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Veal + oniontop 8% of all pairsAroma overlapmoderateMentioned together6,841 recipes
Shared aroma: furaneol (caramel, strawberry).
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Veal + leektop 8% of all pairsAroma overlaplowMentioned together334 recipes
Shared aroma: ethyl butyrate (apple, fruity).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Veal shank
- Its connective tissue breaks down during long simmering into gelatin, which lets the liquid set.
- Veal trimmings
- Add extra collagen and gelatin, giving the gelée more body and a richer meat flavour.
- Egg white
- Coagulates as it heats, trapping cloudy particles so the strained liquid becomes clear.
- Broth
- Forms the liquid base that carries the flavour and sets once cooled.
The step that matters
Clarifying with the egg white. As the whisked egg white heats, it sets into a raft that traps cloudy particles. Stirring or boiling vigorously breaks the raft apart, so the gelée stays cloudy.
Flavor stand-ins for the onion
How well each one fits the dish's main ingredients (veal, leek, parsley, egg):
- Shallotbetter flavor fit
- Carrotbetter flavor fit
- Chivebetter flavor fit
- Onionthe original
Fit is the average pairing score against veal, leek, parsley, egg. 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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