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 ↓
Transparent Pie
Ingredients
Directions
The book says “a moderate oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Prepare
Preheat the oven to 400°F (200°C).
Make the filling
In a bowl, mix the sugar, beaten eggs, and butter with the milk.
Slowly add the lemon juice or lemon extract.
Assemble and bake
Pour the mixture into a prepared pie crust and cover with a second crust.
Bake 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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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Milk + lemontop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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Butter + lemontop 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
- Sugar
- Adds sweetness and helps give the filling its body as it sets.
- Eggs
- Set when heated, giving the filling structure and firmness.
- Butter
- Adds fat for richness and a smooth, tender texture.
- Lemon juice or lemon extract
- Adds acidity and bright flavour that balances the sweetness.
The step that matters
Slowly add the lemon juice or lemon extract. Acid can cause proteins in the eggs and dairy to curdle or thicken unevenly if it hits the mixture too quickly. Adding it slowly and mixing well keeps the filling smooth.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, butter, milk):
- Vanillafits better
- Figfits about as well
- Coconutfits about as well
- Lemonthe original
Fit is the average pairing score against sugar, egg, butter, milk. 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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