Why it works: Flour and sugar are a kitchen classic. They rank in the top 15% of all ingredient pairs, and cooks put them together in 92,116 recipes. Both carry phenylacetaldehyde, which smells hawthorne, honey. The science ↓
Foam Sauce
Ingredients
Directions
In a bowl, combine the beaten yolk of 1 egg with 1 teaspoon of flour and 2 tablespoons of sugar.
Place the bowl in hot water and gradually stir in 1 cup of boiling water.
Cook the mixture for 5 to 10 minutes.
Beat in the well-beaten white of 1 egg.
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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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Egg + flourtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Egg and flour barely smell alike, yet cooks put them together in 106,462 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 yolk
- Thickens the sauce as it cooks and gives it a rich, smooth body.
- Egg white
- Beaten into the cooked mixture to add lightness and a foamy texture.
- Flour
- Helps stabilise the custard so it thickens without curdling.
- Sugar
- Adds sweetness and balances the flavour of the sauce.
The step that matters
Cook the mixture for 5 to 10 minutes. Heat must be gentle and steady so the egg yolk thickens the sauce without scrambling. Stirring while it cooks keeps it smooth and even.
“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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