Why it works: Onion and potato match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and 9,019 recipes mention both. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
The recipe
Ingredients
Contains: milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the base
In a pan, braise the minced onion, celery, and leek in butter for a few minutes without browning.
Add the peeled raw potatoes and cover with strong veal stock.
Add the faggot of herbs and simmer until the potatoes are thoroughly cooked.
Finish the puree
Remove the faggot and rub the mixture through a fine sieve.
Return the puree to a clean saucepan over low heat.
Stir in one-third of its quantity of reduced Bechamel sauce.
Season with salt, white pepper, and a little grated nutmeg.
Serve
Serve with bread slices on the side.
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 + potatotop 2% of all pairsAroma overlapstrongMentioned together9,019 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Onion + leektop 3% of all pairsAroma overlapstrongMentioned together1,326 recipes
Shared aroma: ethyl butyrate (apple, fruity).
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Celery + leektop 4% of all pairsAroma overlapmoderateMentioned together1,093 recipes
Shared aroma: 1-hexanol (resin, flower).
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Celery + potatotop 4% of all pairsAroma overlapstrongMentioned together2,045 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Leek + potatotop 4% of all pairsAroma overlapstrongMentioned together30 recipes
Shared aroma: 1-octen-3-ol (mushroom, earthy).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Cook down to a soft starch that forms the body of the smooth puree.
- Butter
- Gently softens the aromatics and adds richness and a rounded flavour.
- Veal stock
- Cooks the potatoes and adds savoury depth to the puree.
- Reduced bechamel sauce
- Adds creaminess and body, thickening the puree into a smoother texture.
The step that matters
Rub through a fine sieve. Pushing the cooked potatoes through a fine sieve breaks down the starch cells and removes fibres, giving a smooth, lump-free puree rather than a gluey or grainy one.
Flavor stand-ins for the white pepper
How well each one fits the dish's main ingredients (onion, celery, leek, butter, potato, veal, sauce):
- Parsleybetter flavor fit
- Garlicbetter flavor fit
- Thymebetter flavor fit
- White pepperthe original
Fit is the average pairing score against onion, celery, leek, butter, potato, veal, sauce. 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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