Why it works: Milk and vanilla are a kitchen classic. They rank in the top 5% of all ingredient pairs, and cooks put them together in 19,187 recipes. Both carry ethyl caproate, which smells fruity, apple peel. The science ↓
French Chocolate Cake
Ingredients
Directions
Make the chocolate mixture
Boil 2 squares of chocolate, 1 cup of sugar, ½ cup of sweet milk, and 1 egg yolk until thickened, then set aside to cool.
Make the batter
Cream 1 cup of sugar with ⅔ cup of butter.
Add 2 well-beaten eggs, then mix in 1 cup of milk and 1 teaspoon of vanilla.
Stir in the cooled chocolate mixture.
Add 2 cups of flour and 2 teaspoons of baking powder.
Bake and assemble
Bake in three layers.
Assemble with your choice of white frosting.
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.
Photo for illustrative purposes only · Contact us to use it
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.
-
Milk + vanillatop 5% of all pairsSmell alikemoderateCooked together19,187 recipes
Shared aroma: ethyl caproate (fruity, apple peel).
-
Chocolate + vanillatop 5% of all pairsSmell alikemoderateCooked together10,020 recipes
Shared aroma: sotolon (curry, maple).
-
Milk + buttertop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Sugar + vanillatop 8% of all pairsSmell alikelowCooked together35,032 recipes
Shared aroma: beta-damascenone (apple, rose).
-
Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
Sugar and vanilla barely smell alike, yet cooks put them together in 35,032 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
- Chocolate
- Provides the main chocolate flavour and deep colour of the cake.
- Sugar
- Sweetens the cake and helps keep the crumb tender.
- Butter
- Adds fat for a tender texture and rich flavour.
- Eggs
- Bind the batter and add structure as they set in the oven.
- Flour
- Forms the main structure of the cake as the batter sets.
- Baking powder
- Releases gas in the batter so the layers rise and become light.
The step that matters
Cool the chocolate mixture before stirring it in. Adding a hot chocolate mixture to creamed butter and sugar can melt the butter and deflate the batter, so it should be cooled first.
“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.
You might also like
The free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.

Chocolate Cream171 recipes
Vanilla Ice Cream108 recipes
Chocolate Cookies76 recipes
Chocolate Fudge55 recipes