Why it works: Potato and parsley 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: egg, milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare the potatoes
Cut raw potatoes into dice or scoop them with a potato scoop.
Cook the potatoes in salted water until tender.
Drain the potatoes and spread hot butter over them.
Make the dressing
For the dressing, mix 1 tablespoon of butter with the egg yolk.
Add lemon juice, chopped parsley, salt, and pepper to the mixture.
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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Potato + parsleytop 3% of all pairsAroma overlapstrongMentioned together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Lemon + parsleytop 1% of all pairsAroma overlapstrongMentioned together14,036 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Parsley + peppertop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Lemon + peppertop 2% of all pairsAroma overlapstrongMentioned together27,039 recipes
Shared aroma: 2-nonenal (fatty, green).
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Potato + peppertop 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
- Adds richness and carries flavour, coating the potatoes and binding the dressing.
- Egg yolk
- Emulsifies the butter and gives the dressing a smooth, thick body.
- Lemon juice
- Adds acidity that brightens the rich butter and egg dressing.
- Potatoes
- Provide the starchy bulk of the dish, turning tender when cooked in water.
The step that matters
Mixing the butter with the egg yolk. Adding the butter gradually and mixing steadily lets the yolk emulsify it into a smooth dressing. Adding it too fast or with heat can cause the mixture to split or curdle.
“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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