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 ↓
Milk Soup
Ingredients
Directions
Prepare
Peel and chop the potatoes and onions.
In a large pot, combine the potatoes, onions, butter, salt, pepper, and water.
Make the soup
Boil slowly for several hours.
Strain the mixture through a colander.
Return the strained liquid to the pot and add the milk and tapioca.
Boil slowly, stirring constantly for 15 minutes until ready to serve.
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 + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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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 + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
-
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
- Potatoes
- Break down during long simmering to give the soup body and a thick, smooth texture.
- Milk
- Adds creaminess and a soft, mild richness to the finished soup.
- Tapioca
- Thickens the liquid as it heats, giving the soup a fuller body.
- Butter
- Adds fat for a richer mouthfeel and carries flavor through the soup.
- Onions
- Contribute savory sweetness and aroma as they cook down into the broth.
The step that matters
Stirring while the milk and tapioca boil. Tapioca settles and can scorch on the bottom of the pot, and milk can scorch or separate at a hard boil. Constant stirring keeps heat even and the starch dispersed, so the soup thickens smoothly.
Swap the onion
How well each one fits the dish's main ingredients (potato, butter, pepper, milk):
- Capsicumfits better
- Asparagusfits about as well
- Tomatofits about as well
- Onionthe original
Fit is the average pairing score against potato, butter, pepper, 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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