Why it works: Sweet potato and lemon match in chemistry and in kitchens. They rank in the top 10% of all ingredient pairs, and cooks put them together in 314 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Sweet Potato Pie
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 or bake sweet potatoes until soft, then mash to make 2 cups of pulp.
In a bowl, combine the sweet potato pulp, milk, sugar, salt, egg yolks, and lemon extract.
Bake and top
Pour the mixture into a pie crust in a shallow pan.
Bake at 350°F (175°C) until set.
Beat the egg whites with a little powdered sugar until stiff peaks form.
Spread the beaten egg whites on top of the pie and brown lightly in the oven.
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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Sweet potato + lemontop 10% of all pairsSmell alikestrongCooked together314 recipes
Shared aroma: 2-nonenal (fatty, green).
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Milk + lemontop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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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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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Sugar and lemon barely smell alike, yet cooks put them together in 53,532 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
- Sweet potatoes
- Provide the main body and sweet, earthy flavor of the filling.
- Milk
- Adds moisture and liquid that helps the filling set smoothly.
- Sugar
- Sweetens the filling and helps balance the flavor.
- Egg yolks
- Set during baking to give the filling structure and a rich, smooth texture.
- Egg whites
- Whipped into stiff peaks to form a light topping that browns in the oven.
The step that matters
Beating the egg whites to stiff peaks. Egg whites only trap air and hold a stable foam when beaten fully and kept free of fat or yolk. Underbeaten whites will weep or collapse, and the topping will brown unevenly and lack lift.
Swap the sweet potato
How well each one fits the dish's main ingredients (milk, sugar, egg, lemon):
- Asparagusfits about as well
- Arrowrootfits about as well
- Sweet potatothe original
- Capsicumfits about as well
Fit is the average pairing score against milk, sugar, egg, lemon. 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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