Name: Watermelon Cake
Ingredients: 4 eggs, yolks and whites separated; 2 cups sugar; 1 cup milk; 1 cup butter; 1 teaspoon cream of tartar; ½ teaspoon baking soda; 3½ cups flour; red sugar (for coloring); 1 cup seedless raisins

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 ↓

Watermelon 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.

Preheat your oven to 350°F (175°C).
Beat the egg yolks and whites separately until fluffy.
In a large bowl, mix the sugar, milk, butter, cream of tartar, baking soda, and flour until well combined.
Remove half of the batter and mix in red sugar for coloring and the raisins.
Pour the white batter into the pan, then add the red batter in the center.
Bake until a toothpick inserted in the center comes out clean.

Recipe from a historical cookbook (Internet Archive).

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.

Flour + raisintop 1% of all pairs

Smell alikestrong

Cooked together9,075 recipes

Shared aroma: isobutyraldehyde (malty, green).
Milk + buttertop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Butter + creamtop 8% of all pairs

Smell alikemoderate

Cooked together41,516 recipes

Shared aroma: delta-dodecalactone (sweet, creamy).
Sugar + creamtop 9% of all pairs

Smell alikemoderate

Cooked together43,450 recipes

Shared aroma: 2,3-butanedione (butter, sweet).
Butter + flourtop 12% of all pairs

Smell alikelow

Cooked 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

Swap the raisin

How well each one fits the dish's main ingredients (egg, sugar, milk, butter, cream, flour):

Vanillafits better
Raisinthe original
Coconutfits less well
Figfits less well

Fit is the average pairing score against egg, sugar, milk, butter, cream, flour. Candidates are from the same food group and used in at least 100 recipes.