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
Prepare the potatoes
Boil the potatoes until tender, then peel and let them cool.
Cut the potatoes into quarter-inch slices.
Make the sauce
In a clean saucepan, melt the butter over low heat.
Stir in the flour and cook for 2–3 minutes, stirring constantly.
Gradually add the boiling water, stirring until smooth.
Season with salt, pepper, and add the minced parsley.
Combine and serve
Gently toss the potato slices in the sauce over medium heat until heated through.
Just before serving, stir in the lemon juice.
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 + lemontop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Pepper + lemontop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Pepper + potatotop 5% of all pairsAroma overlapstrongMentioned together8,303 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Butter
- Forms the rich base of the sauce and carries the flavour of the parsley and lemon.
- Flour
- Thickens the melted butter into a smooth sauce that clings to the potatoes.
- Potatoes
- Provide the bulk of the dish, holding their shape when firm and gently heated in the sauce.
- Lemon juice
- Adds acidity that brightens the buttery sauce and balances its richness.
The step that matters
Cooking the flour into the butter. Cooking the flour in the melted butter for a couple of minutes removes its raw taste and helps it thicken evenly. Adding the boiling water gradually while stirring prevents lumps.
“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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