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: milk (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
The book says “a slow oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the potatoes
Mash the potatoes and pass them through a sieve.
Season with salt and pepper.
Make the cheese paste
Grate the cheese and pound it with enough milk to make a paste.
Add the milk and chopped parsley to the cheese mixture.
Combine and bake
Combine the potato mixture with the cheese paste and mix well.
Shape into a pyramid and brown slightly in a 400°F (200°C) oven.
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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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Potato + milktop 4% of all pairsAroma overlapstrongMentioned together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
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Cheese + milktop 4% of all pairsAroma overlapstrongMentioned together4,424 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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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
- Potatoes
- Form the main body of the dish, giving a soft, starchy mass that holds its shape.
- Gruyère cheese
- Adds richness and flavour, and melts into the potato to bind it and help it brown.
- Milk
- Moistens the cheese into a paste and loosens the potato mixture for a smooth texture.
The step that matters
Passing the potatoes through a sieve. Sieving breaks down any lumps and removes the coarse texture, so the potato becomes smooth and blends evenly with the cheese paste instead of clumping.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (potato, pepper, cheese, milk):
- Thymeabout as good a flavor fit
- Dillabout as good a flavor fit
- Rosemaryabout as good a flavor fit
- Parsleythe original
Fit is the average pairing score against potato, pepper, cheese, milk. 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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