Why it works: Potato and onion 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 (auto-detected from the ingredients and method; we can miss things, so check labels)
Directions
Prepare
Parboil the potatoes, then peel and let them cool completely.
Cook
In a frying pan, heat butter or dripping and fry the chopped onion until it begins to change color, about 1 minute.
Cut the cooled potatoes into small dice and add them to the pan.
Stir well and cook for 5 minutes, ensuring the potatoes do not break or brown.
Add minced parsley just before removing from heat.
Serve
Drain the potatoes in a heated colander and serve very hot.
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 + oniontop 2% of all pairsAroma overlapstrongMentioned together9,019 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + parsleytop 3% of all pairsAroma overlapstrongMentioned together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Potato + buttertop 6% of all pairsAroma overlapstrongMentioned together6,445 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Onion + parsleytop 6% of all pairsAroma overlapstrongMentioned together25,834 recipes
Shared aroma: coumarin (sweet, hay).
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Butter + oniontop 7% of all pairsAroma overlapmoderateMentioned together42,827 recipes
Shared aroma: guaiacol (smoky, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Form the bulk of the dish; parboiling and cooling firm them so the dice hold their shape when fried.
- Butter or good dripping
- Provides fat for frying, carrying flavor and promoting gentle browning of the potatoes and onion.
- Onion
- Adds aromatic sweetness and savory depth as it softens in the hot fat.
The step that matters
Stir and cook the diced potatoes gently. Cooled, parboiled potatoes are firm, so gentle stirring keeps the dice intact; vigorous stirring breaks them into mash and uneven browning prevents an even golden crust.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (potato, butter, onion):
- Garlicbetter flavor fit
- Parsleythe original
- Thymeabout as good a flavor fit
Fit is the average pairing score against potato, butter, onion. 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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