Why it works: Butter and flour 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 ↓
Chocolate Cream Filling
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 dough
Melt the chocolate and set aside.
In a saucepan, combine boiling water, salt, and butter; bring to a boil.
Add flour all at once and stir until the mixture forms a ball.
Cool slightly, then add eggs one at a time, beating well after each addition.
Bake
Drop spoonfuls onto an oiled baking sheet, spacing them 1½ inches apart.
For a glazed surface, brush with egg white before baking.
Bake at 350°F (175°C) for 30 to 35 minutes until golden.
Fill and serve
Once cool, cut a slit in the top or side and fill with sweetened whipped cream or Chocolate Cream Filling.
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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Chocolate + sugartop 13% of all pairsSmell alikemoderateCooked together15,404 recipes
Shared aroma: guaiacol (smoky, sweet).
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Sugar + flourtop 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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Chocolate + buttertop 16% of all pairsSmell alikemoderateCooked together10,543 recipes
Shared aroma: delta-decalactone (sweet, creamy).
Butter and flour 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
- Forms the starch structure of the paste that puffs and holds the cookie shape.
- Eggs
- Add moisture and structure, and help the cookies puff and set as they bake.
- Butter
- Adds fat for tenderness and flavour in the choux-style paste.
- Chocolate
- Gives the cookie its chocolate flavour and colour.
- Sugar
- Adds sweetness and helps the surface brown as the cookies bake.
The step that matters
Adding the eggs. The paste must be cool enough that the eggs do not scramble, yet still warm enough to absorb them smoothly. Beat well after each egg so the batter becomes smooth and able to puff in the oven.
“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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