Why it works: Onion and potato 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 says “a moderate oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Prepare a perforated tin lid with handles to fit a pie dish.
Wash the lid in boiling soda and water before first use.
Assemble
Cut the cold meat into neat slices and season with pepper and salt.
Add the minced onions, gravy (or water), and butter or dripping to the meat.
Cover with the tin lid and pile the mashed potatoes on top until full.
Bake and serve
Bake in a well-heated oven at 400°F (200°C) for one hour.
Serve the pie in the baking dish, wrapped in a hot napkin.
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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Onion + potatotop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Pepper + potatotop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Potato + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
-
Pepper + oniontop 11% of all pairsSmell alikemoderateCooked together68,474 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
- Cold meat
- Forms the savoury filling that the pie is built around.
- Onions
- Add aroma and a mild sweetness as they soften in the pan juices.
- Butter or beef dripping
- Adds fat and richness, carrying flavour through the filling.
- Gravy or water
- Supplies moisture so the filling stays juicy while baking.
- Cold boiled potatoes
- Form a soft, browning crust on top of the pie.
The step that matters
Piling the mashed potatoes on top. Potatoes that are too wet or thin can sink into the filling or steam rather than brown, so they should be mashed stiff with milk and piled high to seal the meat below.
Swap the onion
How well each one fits the dish's main ingredients (meat, pepper, butter, potato, milk):
- Capsicumfits better
- Asparagusfits about as well
- Tomatofits about as well
- Onionthe original
Fit is the average pairing score against meat, pepper, butter, potato, milk. 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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