Why it works: Potato and lemon are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 2,230 recipes. Both carry 2-nonenal, which smells fatty, green. The science ↓
Potato Starch Lemon Pie
Ingredients
Directions
Make the filling
Mix potato starch and sugar in a bowl.
Add boiling water, stirring constantly until thickened, about 5 minutes.
Remove from heat and stir in butter, egg yolks, lemon rind, and lemon juice.
Pour the mixture into a pre-cooked pie crust.
Top and brown
Top with meringue made from the egg whites.
Return to the oven to brown the meringue.
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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Potato + lemontop 12% of all pairsSmell alikemoderateCooked together2,230 recipes
Shared aroma: 2-nonenal (fatty, green).
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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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Lemon + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Sugar + buttertop 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
- Potato starch
- Thickens the filling into a smooth, sliceable custard as it heats in the boiling water.
- Egg yolks
- Add richness and help set the filling once it is combined with the hot starch mixture.
- Lemon juice
- Adds the sharp acidity that balances the sweetness of the sugar.
- Sugar
- Sweetens the filling and helps hold moisture in the custard.
The step that matters
Stirring the boiling water into the starch and sugar. Starch only thickens properly when it is stirred constantly while hot. Stopping or adding the water too fast can leave lumps or a thin filling that does not set firmly.
Swap the potato
How well each one fits the dish's main ingredients (sugar, egg, lemon, butter):
- Asparagusfits better
- Leekfits better
- Shallotfits better
- Potatothe original
Fit is the average pairing score against sugar, egg, lemon, butter. 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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