Why it works: Potato and onion are a kitchen classic. They rank in the top 3% of all ingredient pairs, and cooks put them together in 9,023 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Potato Pie
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat the oven to 400°F (200°C).
Layer the sliced potatoes in a pie dish, adding chopped onion, pepper, and salt between each layer.
Add a little water and dot the top with pieces of butter.
Cover the pie with puff pastry and seal it well.
Bake and serve
Bake for about 1.5 hours.
If desired, add hard-boiled egg yolks and pour in mushroom ketchup through a funnel after baking.
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 their aromas overlap, and how often cooks already put them together.
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Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Butter + mushroomtop 7% of all pairsSmell alikemoderateCooked together12,525 recipes
Shared aroma: trans-2-decenal (waxy, orange).
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Potato + peppertop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Potato + mushroomtop 9% of all pairsSmell alikestrongCooked together968 recipes
Shared aroma: 1-octen-3-one (mushroom, metallic).
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Onion + mushroomtop 10% of all pairsSmell alikemoderateCooked together10,626 recipes
Shared aroma: 2,4-decadienal (seaweed).
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 filling, becoming tender and soft as they cook through.
- Butter
- Adds richness and moisture, and helps the top brown as it melts over the potatoes.
- Puff pastry
- Forms a sealed, flaky crust that traps steam and browns in the oven.
- Onion
- Adds savory flavor that mellows and sweetens as it bakes among the potatoes.
The step that matters
Seal the puff pastry well. A tight seal keeps steam inside the pie, which cooks the potatoes through. A gap lets steam escape, leaving the filling dry or underdone.
Swap the onion
How well each one fits the dish's main ingredients (potato, pepper, butter, egg, mushroom, ketchup):
- Capsicumfits better
- Chivefits better
- Asparagusfits about as well
- Onionthe original
Fit is the average pairing score against potato, pepper, butter, egg, mushroom, ketchup. Candidates are from the same food group and used in at least 100 recipes.
“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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