Why it works: Arrowroot and flour match in chemistry and in kitchens. They rank in the top 2% of all ingredient pairs, and cooks put them together in 525 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
French Cream Cake
Ingredients
Directions
The book says “a quick oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.
Make the custard
Boil the sweet milk in a saucepan.
In a bowl, mix cornstarch or arrowroot with a little milk.
Add the eggs and beat together.
Stir the egg mixture into the boiling milk and cook until thickened.
Remove from heat and stir in sugar, butter, and flavoring extract.
Bake the cakes
In another bowl, combine eggs, powdered sugar, flour, baking soda, cream of tartar, and water.
Divide the batter into two deep pie plates.
Bake at 400°F (200°C) until golden.
Assemble and serve
Once baked, split the cakes while warm.
Fill with the cream mixture.
Store in a cool place for one to two days before serving.
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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Arrowroot + flourtop 2% of all pairsSmell alikestrongCooked together525 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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Butter + creamtop 8% of all pairsSmell alikemoderateCooked together41,516 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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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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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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
- Eggs
- Set the custard and give structure and richness to the cake batter.
- Cornstarch or arrowroot
- Thickens the boiled milk into a smooth, sliceable cream filling.
- Flour
- Provides the structure that holds the cake together when split and filled.
- Cream of tartar
- Acidifies the batter so it reacts with baking soda to help the cakes rise.
- Baking soda
- Reacts with the acid in the batter to produce gas that lifts the cakes.
- Butter
- Adds fat for richness and a softer texture in the cream filling.
The step that matters
Cook the custard until thickened. Cornstarch or arrowroot must reach a boil in the milk to fully thicken. Undercooked starch leaves the filling thin and runny, and the cream will not hold once the cakes are filled.
Swap the arrowroot
How well each one fits the dish's main ingredients (milk, egg, sugar, butter, flour, cream):
- Leekfits about as well
- Potatofits about as well
- Sweet potatofits about as well
- Arrowrootthe original
Fit is the average pairing score against milk, egg, sugar, butter, flour, 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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