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 ↓
Sweet Potato Pies
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare the filling
Boil the sweet potatoes until thoroughly cooked, then mash them well.
In a bowl, combine the mashed sweet potatoes, eggs, and sweet milk to achieve a smooth consistency.
Add a lump of butter and mix until well combined.
Prepare a rich pastry for the top crust.
Assemble and bake
Spread the sweet potato mixture into the pie crust.
Beat the egg whites with a little sugar until stiff peaks form, then spread over the top of the pie.
Sprinkle spices on top to taste.
Bake in a moderate oven at 350°F (175°C) 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.
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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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Sweet potato + milktop 15% of all pairsSmell alikemoderateCooked together596 recipes
Shared aroma: 4-heptenal (creamy, biscuit).
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Sweet potato + sugartop 17% of all pairsSmell alikemoderateCooked together1,151 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + sugartop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Sweet potatoes
- Provide the main body of the filling, with starch and sweetness once cooked and mashed.
- Eggs
- Bind the mashed filling so it sets into a sliceable custard-like texture when baked.
- Sweet milk
- Adds moisture and loosens the mash into a smooth filling.
- Butter
- Adds richness and fat, giving the filling a softer, smoother mouthfeel.
- Egg whites
- Whipped with sugar into a meringue topping that browns and adds lightness.
The step that matters
Beating the egg whites to stiff peaks. Whites must be whipped until stiff and glossy with sugar to hold their air. Under-whipped whites deflate and weep, while the sugar stabilises the foam so the topping stays airy and browns evenly in the oven.
Swap the sweet potato
How well each one fits the dish's main ingredients (egg, milk, butter, sugar):
- Potatofits about as well
- Sweet potatothe original
- Asparagusfits about as well
- Capsicumfits about as well
Fit is the average pairing score against egg, milk, butter, sugar. 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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