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 ↓
Custard Sauce
Ingredients
Directions
Make the custard
In a double boiler, heat the milk until boiling.
Beat the egg yolks until light, then add the sugar and beat again until light.
Stir the egg mixture into the boiling milk.
Stir until the mixture coats the back of a knife blade.
Finish
Add the vanilla and set aside to cool.
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.
Photo for illustrative purposes only · Contact us to use it
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
- Milk
- Forms the liquid base that gives the sauce its body and creamy texture.
- Egg yolks
- Egg proteins set as the sauce heats, thickening it into a smooth custard.
- Sugar
- Adds sweetness and balances the richness of the milk and yolks.
- Vanilla
- Adds the main aroma and flavour to the sauce.
The step that matters
Thicken the custard gently. Egg yolk proteins set as the custard heats, which thickens it. Too much heat or too little stirring can scramble the eggs into lumps, so stop when the sauce coats the back of a blade.
“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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