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 ↓
Boiled Custard
Ingredients
Directions
Heat the milk to a boil in a double boiler or in a tin pail set in a pot of boiling water.
In warm weather, add a small piece of baking soda to the milk.
While the milk is heating, beat the eggs in a bowl.
When the milk is scalding, add the salt and sugar, then pour the hot liquid over the eggs, stirring continuously.
Beat well and return the mixture to the double boiler, keeping the water at a hard boil.
Stir two or three times in the first five minutes, then stir almost constantly.
After about 15 minutes, the custard should be done when it turns creamy yellow and has a soft, rich consistency.
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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Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
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Milk + eggtop 18% of all pairsSmell alikemoderateCooked together88,785 recipes
Shared aroma: 2-nonenal (fatty, green).
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Milk + sugartop 18% of all pairsSmell alikelowCooked together77,875 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
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
- Eggs
- Thicken the custard as they set with heat, giving it body and a rich texture.
- Milk
- Forms the liquid base that the eggs thicken into a smooth custard.
- Sugar
- Sweetens the custard and adds to its smooth, rich mouthfeel.
The step that matters
Stirring the custard as it returns to the boil. Egg proteins set and can curdle if they overheat or sit still, so stirring constantly and keeping the heat controlled keeps the custard smooth and thickened.
“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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