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 ↓
Baked Potatoes
Ingredients
Directions
Make the creamed potatoes
Separate egg whites from yolks, cut the whites into dice and add to the potato.
Fry onions in butter until softened.
Add flour and seasonings, then gradually add the milk, stirring well.
Let boil, add potatoes, and when very hot turn into a serving dish.
Put egg yolks through a potato ricer over the dish.
Serve at once.
Bake the mashed potatoes
Add milk, salt, butter, flour and eggs beaten to a froth to the cold mashed potatoes.
Mix the whole until thoroughly light.
Put into a pudding or vegetable dish, spread a little butter over the top and bake until golden brown.
Beat the eggs very thoroughly before adding them so the potato stays light and porous after baking.
Make the white sauce and gratin
Make a sauce of 1 tablespoon butter and 1 tablespoon flour rubbed together until smooth, then add a little salt and 1 cupful of boiling milk.
Slice cold boiled potatoes into the casserole dish, season and cover with the white sauce.
Sprinkle with breadcrumbs and grated cheese, then brown in the oven.
Nutrition, whole recipe (rough)
What these numbers assume: 7 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Flour | 1 cup (125g) all-purpose | 455 |
| Potato | 1 medium (173g) baked | 161 |
| Milk | 1 cup (244ml) whole | 149 |
| Butter | 1 tbsp (14g) | 102 |
| Egg | 1 large egg (50g) | 78 |
| Onion | 1 medium (110g) | 44 |
| Salt | 1 tsp (6g) | 0 |
One typical portion per ingredient; the recipe's quantities are not counted. A rough guide only, not for medical or dietary planning.
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. See the original page.
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.
-
Potato + oniontop 3% of all pairsSmell alikemoderateCooked together9,023 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Potato + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
-
Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Potato + buttertop 13% of all pairsSmell alikemoderateCooked together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
Flour and butter barely smell alike, yet cooks put them together in 124,287 recipes: they work on texture and structure more than aroma.
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 and give it a soft, creamy body.
- Eggs
- Beaten whites trap air, keeping the potato light and airy after baking.
- Milk
- Adds moisture and, once thickened, forms the creamy sauce.
- Flour
- Thickens the milk into a smooth sauce.
- Butter
- Adds richness and flavour and helps the top turn golden.
- Onions
- Adds savoury flavour when softened in butter.
The step that matters
Beating the eggs thoroughly. Beating eggs well incorporates air into them. That trapped air expands in the oven, so the potato bakes up light and porous. Poorly beaten eggs leave the mixture dense.
Swap the onion
How well each one fits the dish's main ingredients (potato, flour, milk, butter, egg):
- Chivefits better
- Asparagusfits better
- Leekfits better
- Onionthe original
Fit is the average pairing score against potato, flour, milk, butter, egg. 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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