Name: California Doughnuts
Ingredients: 1 pint boiled milk; 1 cup butter; 2 cups sugar; 1 cup mashed potatoes; 2 eggs; 1 cup yeast; flour (as needed)

Why it works: Milk and butter 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 ↓

California Doughnuts

Ingredients

Directions

Make the dough

Mix boiled milk, butter, sugar, mashed potatoes, eggs, and yeast together.
Let the mixture stand until bedtime.
In the morning, add enough flour to make a soft dough.

Shape

Roll out the dough for baking; it should be as soft as possible to handle.

Recipe from a historical cookbook (Internet Archive).

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.

Milk + buttertop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Milk + potatotop 9% of all pairs

Smell alikemoderate

Cooked together3,611 recipes

Shared aroma: (e,z)-2,6-nonadienal (cucumber, melon).
Butter + flourtop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

Shared aroma: isobutyraldehyde (malty, green).
Butter + potatotop 13% of all pairs

Smell alikemoderate

Cooked together6,456 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Milk + flourtop 14% of all pairs

Smell alikelow

Cooked together78,219 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

Butter: Adds fat for a tender crumb and rich flavour.
Eggs: Add structure and richness, helping the dough bind and set.
Mashed potatoes: Add moisture and softness to the dough.
Yeast: Makes the dough rise through fermentation, giving it an airy texture.
Flour: Provides the structure that holds the dough together.

The step that matters

Adding the flour in the morning. Flour must be added gradually until the dough is soft but manageable. Too much flour makes the dough dense and dry, while too little leaves it sticky and hard to shape.

Swap the potato

How well each one fits the dish's main ingredients (milk, butter, sugar, egg, flour):

Sweet potatofits about as well
Leekfits about as well
Arrowrootfits about as well
Potatothe original

Fit is the average pairing score against milk, butter, sugar, egg, flour. 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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Pound Cake373 recipes

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California Doughnuts