Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Mashed Potatoes
Ingredients
Directions
Prepare
Peel the potatoes and soak them in cold water for 30 minutes.
Place the potatoes in a saucepan, cover with water, and add a little salt.
Boil until tender.
Mash and serve
Drain the water and mash the potatoes until smooth using a potato masher.
Melt the butter in the boiling milk and mix it with the mashed potatoes until smooth, ensuring they are not too wet.
Transfer the mashed potatoes to a serving dish, heaping them up and smoothing the top.
Place a small piece of butter in the center and dot the surface with black pepper.
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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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).
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Potato + buttertop 13% of all pairsSmell alikemoderateCooked together6,456 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Potatoes
- Provide the starch that forms the bulk and fluffy body of the mash.
- Butter
- Adds fat and richness, giving the mash a smooth, silky mouthfeel.
- Milk
- Adds moisture and softness so the mashed potatoes spread smoothly.
The step that matters
Mashing with hot liquid. Adding cold milk or butter cools the potatoes and can make the mash gluey or stiff. Boiling hot milk stays warm and blends in smoothly. Overworking the mash after adding liquid can also turn starch gummy, so mix only until smooth.
Swap the potato
How well each one fits the dish's main ingredients (butter, egg, milk, pepper):
- Capsicumfits about as well
- Potatothe original
- Asparagusfits about as well
- Chivefits less well
Fit is the average pairing score against butter, egg, milk, 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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