Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓
Boiled Custard
Ingredients
Directions
Prepare the milk
Simmer the milk with lemon peel and bay leaf in a clean saucepan.
Sweeten the milk to taste.
Make the custard
While gently boiling, add the beaten yolks and whites of the eggs.
Stir continuously until the custard thickens, then remove from heat.
Continue stirring until the custard cools.
Strain and finish
Strain the milk before adding the eggs and pass the eggs through a sieve.
For added flavor, consider using essence of almonds or adding a little cream.
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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Sugar + creamtop 9% of all pairsSmell alikemoderateCooked together43,450 recipes
Shared aroma: 2,3-butanedione (butter, sweet).
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Lemon + almondtop 10% of all pairsSmell alikestrongCooked together5,655 recipes
Shared aroma: eucalyptol (eucalyptus, herbal).
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Milk + lemontop 15% of all pairsSmell alikemoderateCooked together19,053 recipes
Shared aroma: 2-nonenal (fatty, green).
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Almond + creamtop 16% of all pairsSmell alikemoderateCooked together5,130 recipes
Shared aroma: 2-heptanol (bitter, floral).
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Milk + almondtop 16% of all pairsSmell alikemoderateCooked together5,800 recipes
Shared aroma: 2,4-decadienal (seaweed).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Eggs
- Proteins set as they heat, thickening the milk into a custard.
- Milk
- Forms the liquid base and body of the custard, carrying the flavor.
- Sugar
- Sweetens the custard and softens the flavor of the eggs and milk.
The step that matters
Stirring while the custard thickens. Egg proteins set gently as they warm. If the custard overheats or is left unstirred, the proteins tighten and curdle into lumps, leaving a grainy texture. Stirring continuously and removing it from heat as it thickens keeps it smooth.
Swap the almond
The recipe marks almond as optional. How well each one fits the dish's main ingredients (milk, lemon, sugar, egg, cream):
- Almondthe original
- Pistachiofits about as well
- Chestnutfits about as well
- Walnutfits less well
Fit is the average pairing score against milk, lemon, sugar, egg, cream. 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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