Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓
Butterscotch Pie Filling
Ingredients
Directions
Make the filling
Boil the water and brown sugar together in a saucepan.
Beat the egg yolks with the milk and cornstarch in a separate bowl.
Add the salt and vanilla to the egg mixture.
Combine the egg mixture with the boiling sugar water in a double boiler.
Cook until thickened, stirring frequently.
Fill and brown
Pour the filling into a baked pie crust.
Spread beaten egg whites on top and return to the oven to 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 + vanillatop 5% of all pairsSmell alikemoderateCooked together19,187 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
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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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Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
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Butter + vanillatop 14% of all pairsSmell alikemoderateCooked together20,050 recipes
Shared aroma: guaiacol (smoky, sweet).
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Butter + eggtop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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
- Egg yolks
- Thicken the custard as they set with gentle heat, giving a rich, smooth body.
- Cornstarch
- Thickens the filling by swelling in hot liquid, so it sets firm enough to slice.
- Brown sugar
- Provides sweetness and the characteristic butterscotch flavour from its molasses.
- Milk
- Supplies the liquid base that gives the filling its creamy texture.
- Butter
- Adds fat for richness and a smooth mouthfeel.
The step that matters
Cook until thickened, stirring frequently. Cornstarch only thickens fully once it reaches a high enough temperature, and egg yolks can curdle if overheated. Constant stirring in the double boiler spreads heat evenly, prevents lumps and scorching, and keeps the custard smooth.
“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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