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
Place the milk in a bucket and set it in a kettle with boiling water to prevent burning.
Add the salt to the water to help it boil faster.
Make the custard
When the milk is scalding hot, stir in the beaten egg yolks until the custard thickens.
Do not let it boil too long to avoid curdling.
Finish
Whip the egg whites to stiff peaks and gently fold them into the custard.
Let it cool and then flavor with vanilla or bitter almond extract.
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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Sugar + eggtop 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
- Milk
- Forms the liquid base that the egg yolks thicken into a custard.
- Eggs
- Yolks thicken the custard as their proteins set with heat; whites add lightness when whipped and folded in.
- White sugar
- Adds sweetness to the custard.
- Vanilla or bitter almond extract
- Adds aroma and flavor to the finished custard.
The step that matters
Do not let it boil too long. Egg proteins thicken the custard as they gently set with heat. If the custard overheats or boils too long, the proteins tighten further and squeeze out water, causing curdling and a grainy texture.
“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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