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 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.
Stir in the flour and sugar.
Cook until the mixture pulls away from the sides of the pan, then remove from heat.
Beat in each egg separately.
Shape and bake
Dip a knife and two dessert spoons in hot water.
Shape the mixture into egg-like forms.
Place them on a greased baking sheet, spaced apart.
Bake for 1 hour in a moderate oven (350°F / 175°C).
Fill 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).
-
Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
-
Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
-
Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
-
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
- Flour
- Gives the paste body so it holds its shape while baking.
- Eggs
- Set the structure and help the paste puff as steam forms.
- Butter
- Adds fat for a tender, rich texture.
- Cold water
- Turns to steam in the oven, helping the pastry rise and puff.
- Castor sugar
- Adds sweetness and helps the surface brown.
The step that matters
Beating in the eggs. Add each egg separately and beat until fully absorbed before adding the next. The paste must take up each egg completely, or it turns loose, which stops it holding its shape and puffing 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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