Why it works: Flour and butter are a kitchen classic. They rank in the top 12% of all ingredient pairs, and cooks put them together in 124,287 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
French Pastry
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Make the paste
Boil the butter and cold water in a saucepan.
Once boiling, stir in the flour and sugar, cooking until the mixture leaves the sides of the saucepan.
Remove from heat and beat in each egg separately.
Shape and bake
Dip a knife and two teaspoons in hot water.
Shape the mixture like eggs.
Place them on a greased baking sheet, spaced apart.
Bake for 1 hour in a moderate oven at 350°F (175°C).
Finish and serve
Once done, open the sides and fill with preserves or whipped 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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Flour + buttertop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Butter + sugartop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
Flour and butter barely smell alike, yet cooks put them together in 124,287 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
- Bind the paste and give the baked shells structure and lift.
- Flour
- Provides the starch that sets the cooked paste and gives the shells their body.
- Butter
- Adds fat and richness, and softens the texture of the paste.
- Cold water
- Provides the liquid that turns to steam in the oven, helping the shells puff.
- Castor sugar
- Adds sweetness and helps the shells brown during baking.
The step that matters
Beat in each egg separately. Adding eggs one at a time lets each one fully blend into the paste, so the mixture stays smooth and can hold its shape. Adding them all at once can cause the paste to split or turn runny, and the shells may not rise properly.
“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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