Name: Pistachio Filling for Cake
Ingredients: 1 egg white; ½ egg shell (use as a measuring cup); cold water (as needed); ½ pound confectioners' sugar; ½ teaspoon orange extract; ½ teaspoon almond extract; green food coloring; pistachio nuts (for sprinkling)

Why it works: Almond and pistachio match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 693 recipes. Both carry alpha-pinene, which smells pine, turpentine. The science ↓

Pistachio Filling for Cake

Ingredients

Directions

Make the filling

In a bowl, combine the egg white, egg shell, cold water, confectioners' sugar, orange extract, almond extract, and green food coloring. Beat the mixture well until smooth.

Assemble and serve

Spread the filling between layers of cake.
Sprinkle with pistachio nuts before serving.

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.

Almond + pistachiotop 1% of all pairs

Smell alikestrong

Cooked together693 recipes

Shared aroma: alpha-pinene (pine, turpentine).
Pistachio + nutstop 1% of all pairs

Smell alikestrong

Cooked together425 recipes

Shared aroma: alpha-pinene (pine, turpentine).
Orange + almondtop 6% of all pairs

Smell alikemoderate

Cooked together3,125 recipes

Shared aroma: 2,4-decadienal (seaweed).
Almond + nutstop 6% of all pairs

Smell alikemoderate

Cooked together394 recipes

Shared aroma: 2,3-pentanedione (butter, sweet).
Orange + pistachiotop 11% of all pairs

Smell alikemoderate

Cooked together328 recipes

Shared aroma: pinene (pine, turpentine).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Egg white: Whips and sets to give the filling body and a smooth, stable structure.
Confectioners' sugar: Dissolves into the mixture to add sweetness and a thick, spreadable texture.

Swap the orange

How well each one fits the dish's main ingredients (egg, sugar, almond, pistachio, nuts):

Vanillafits better
Raisinfits better
Figfits better
Orangethe original

Fit is the average pairing score against egg, sugar, almond, pistachio, nuts. 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.