Why it works: Flour and raisin match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 9,075 recipes. Both carry isobutyraldehyde, which smells malty, green. The science ↓
Neapolitan Cake
Ingredients
Directions
The book gives no oven temperature. The 350°F (175°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat the oven to 350°F (175°C).
Make the batters
In a bowl, mix together the brown sugar, eggs or yolks, butter, molasses, coffee, flour, raisins, currants, baking soda, cinnamon, cloves, and mace for the black part.
In another bowl, cream the sugar and butter for the white part, then add the milk, flour, egg whites, cream of tartar, and baking soda or baking powder.
Bake
Layer the black and white mixtures alternately in a greased cake pan.
Bake until a toothpick inserted in the center comes out clean.
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 + raisintop 1% of all pairsSmell alikestrongCooked together9,075 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Raisin + curranttop 10% of all pairsSmell alikelowCooked together6,180 recipes
Shared aroma: gamma-nonanolactone (coconut, creamy).
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Sugar + molassestop 11% of all pairsSmell alikemoderateCooked together9,225 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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Butter + flourtop 12% of all pairsSmell alikelowCooked together124,287 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Molasses + raisintop 12% of all pairsSmell alikelowCooked together3,577 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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 or egg yolks
- Bind the batter and add richness and structure as they set in the oven.
- Flour
- Provides the structure that sets the cake crumb as it bakes.
- Butter
- Adds fat for tenderness and a rich flavor in both batters.
- Baking soda
- Reacts with the acidic molasses and coffee to lift the dark batter.
- Egg whites
- Whipped-free here, they add lift and a light, open texture to the white batter.
- Cream of tartar
- Stabilizes the egg whites and helps keep the white batter light.
The step that matters
Layering the black and white mixtures. Alternating the two batters in the pan keeps the dark and light layers distinct. Pouring them carelessly can blend the colors, so the cake loses its striped Neapolitan look.
Swap the currant
How well each one fits the dish's main ingredients (sugar, egg, butter, molasses, coffee, flour, raisin):
- Vanillafits better
- Figfits better
- Applefits about as well
- Currantthe original
Fit is the average pairing score against sugar, egg, butter, molasses, coffee, flour, raisin. 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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