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, wheat (auto-detected from the ingredients and method; we can miss things, so check labels)
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 the filling
Boil and mash the potatoes, then mix in cream and butter.
Add the ham, parsley, grated onion, pepper, and salt to the mashed potatoes.
Bake and serve
Transfer the mixture to a fire-proof dish.
Cover the top with bread crumbs and dot with butter.
Bake at 400°F (200°C) for 20 minutes until browned.
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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Pepper + parsleytop 2% of all pairsAroma overlapstrongMentioned together34,118 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
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Bread + buttertop 3% of all pairsAroma overlapstrongMentioned together27,145 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Ham + breadtop 3% of all pairsAroma overlapstrongMentioned together2,536 recipes
Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
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Potato + parsleytop 3% of all pairsAroma overlapstrongMentioned together2,855 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Form the soft, starchy base that holds the rest of the filling together.
- Butter
- Adds richness and fat, and helps the top brown in the oven.
- Cream
- Adds moisture and smoothness to the mashed potatoes.
- Bread crumbs
- Form a crisp, golden topping when baked.
- Ham
- Adds savory, salty flavor to the potato mixture.
- Onion
- Adds aroma and savory sweetness to the filling.
The step that matters
Browning the topping. The bread crumbs and butter on top need the oven's dry heat to brown properly. If the dish is covered or the oven is too cool, the top stays pale and soft instead of crisp and golden.
Flavor stand-ins for the parsley
How well each one fits the dish's main ingredients (potato, pepper, ham, bread, butter, onion, cream):
- Garlicabout as good a flavor fit
- Celeryabout as good a flavor fit
- Parsleythe original
- Thymeabout as good a flavor fit
Fit is the average pairing score against potato, pepper, ham, bread, butter, onion, cream. 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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