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 ↓
Doughnuts
Ingredients
Directions
Make the dough
In a bowl, mix sugar, eggs, and melted butter until combined.
Add warm mashed potatoes and mix well.
In another bowl, combine flour and baking powder, then add to the potato mixture.
Stir in sweet milk and nutmeg until a dough forms.
Shape and fry
Roll out the dough and cut into shapes.
Fry in hot lard until golden brown.
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.
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.
-
Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Potato + nutmegtop 8% of all pairsSmell alikemoderateCooked together1,052 recipes
Shared aroma: 4'-methylacetophenone (bitter almond).
-
Flour + nutmegtop 8% of all pairsSmell alikemoderateCooked together18,623 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Potato + milktop 9% of all pairsSmell alikemoderateCooked together3,611 recipes
Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Butter and flour 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
- Eggs
- Bind the dough and add richness and structure as they set.
- Flour
- Provides the main structure that holds the doughnut shape.
- Baking powder
- Releases gas in the dough, helping the doughnuts rise and lighten.
- Mashed potatoes
- Add moisture and tenderness to the dough.
- Butter
- Adds fat for tenderness and flavor.
- Sugar
- Adds sweetness and helps the surface brown during frying.
The step that matters
Fry in hot lard until golden brown. If the lard is not hot enough, doughnuts absorb excess oil and turn greasy; if too hot, the outside browns before the centre cooks through.
Swap the potato
How well each one fits the dish's main ingredients (sugar, egg, butter, flour, milk, nutmeg):
- Sweet potatofits better
- Arrowrootfits about as well
- Leekfits about as well
- Potatothe original
Fit is the average pairing score against sugar, egg, butter, flour, milk, nutmeg. 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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Deep-Fried Potato Balls119 recipes
Orange Potato Bread80 recipes
White Cake431 recipes
Pound Cake373 recipes