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 Soup
Ingredients
Directions
Make the soup
Put the milk in a double boiler and scald it. When scalded, add the mashed potato and cook for ten minutes.
Melt the butter, stir in the flour, add salt and pepper, and add to the milk mixture.
Cook the onion with the potato.
Add seasoning and strain through a strainer.
Serve
Reheat and serve with croutons or hot crackers.
Nutrition, whole recipe (rough)
What these numbers assume: 6 portions
| Ingredient | Portion assumed | kcal |
|---|---|---|
| Flour | 1 cup (125g) all-purpose | 455 |
| Mashed Potato | 1 medium (173g) baked | 161 |
| Milk | 1 cup (244ml) whole | 149 |
| Butter | 1 tbsp (14g) | 102 |
| Onion | 1 medium (110g) | 44 |
| Black Pepper | 1 tsp ground (2.3g) | 6 |
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.
Photo for illustrative purposes only · Contact us to use it
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).
-
Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Potato + peppertop 9% of all pairsSmell alikemoderateCooked together8,305 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Milk + potatotop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
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Onion + peppertop 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
- Milk
- Forms the liquid base of the soup and carries the other flavors.
- Mashed potato
- Thickens the soup and gives it a smooth, full body.
- Butter
- Adds richness and carries flavor when melted into the soup.
- Flour
- Thickens the butter and milk mixture so the soup becomes creamy.
- Onion
- Adds savory aroma and depth as it cooks with the potato.
The step that matters
Add the butter and flour mixture to the milk. Flour needs to be melted into the butter first and then combined with the hot milk so it thickens smoothly. Adding it raw or in clumps can leave lumps or a pasty texture in the soup.
Swap the onion
How well each one fits the dish's main ingredients (milk, potato, butter, flour, pepper):
- Chivefits better
- Capsicumfits better
- Asparagusfits better
- Onionthe original
Fit is the average pairing score against milk, potato, butter, flour, pepper. 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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