Why it works: Parsley and potato match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and 2,855 recipes mention both. Both carry 4'-methylacetophenone, which smells bitter almond. The science ↓
The recipe
Ingredients
Contains: milk, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Make the sauce
In a saucepan, melt the butter over medium heat.
Add the chopped parsley, salt, and pepper; stir until hot.
Pour in the cream or milk and bring to a simmer.
Whisk in the flour until the mixture thickens and boils.
Finish and serve
Chop the cold boiled potatoes and add them to the mixture.
Boil once more before serving.
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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Parsley + potatotop 3% of all pairsAroma overlapstrongMentioned together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Parsley + peppertop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Butter + creamtop 3% of all pairsAroma overlapstrongMentioned together41,494 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Pepper + potatotop 5% of all pairsAroma overlapstrongMentioned together8,303 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + potatotop 6% of all pairsAroma overlapstrongMentioned together6,445 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Adds richness and flavour to the sauce base.
- Cream or rich milk
- Forms the liquid body of the sauce and adds richness.
- Flour
- Thickens the liquid into a smooth sauce as it heats and boils.
- Cold boiled potatoes
- Form the bulk of the dish, absorbing the sauce as they heat through.
The step that matters
Whisk in the flour until the mixture thickens and boils. Flour must be whisked in steadily so starch granules disperse evenly; clumps form if it is dumped in, leaving lumps in the sauce. Boiling is needed for the starch to fully thicken.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (butter, pepper, cream, flour, potato):
- Nutmegabout as good a flavor fit
- Parsleythe original
- Celeryabout as good a flavor fit
Fit is the average pairing score against butter, pepper, cream, flour, potato. 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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