Name: German Christmas Cake
Ingredients: 6 egg yolks; ½ pound fresh butter, softened; ½ pound powdered sugar; ¾ pound all-purpose flour; 1 tablespoon vanilla extract

Why it works: Sugar and vanilla are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 35,032 recipes. Both carry beta-damascenone, which smells apple, rose. The science ↓

German Christmas Cake

Oven, in the book's wordsA very hot oven

Ingredients

Directions

The book says “a very hot oven”. The 400°F (200°C) in the steps is the modern equivalent, not the book's own figure.

Prepare

Preheat the oven to 400°F (200°C).

Make the dough

In a mixing bowl, beat the butter and powdered sugar until creamy.
Add the egg yolks and mix well.
Gradually add the flour and vanilla extract, mixing until combined.

Shape and bake

Shape the mixture into the letter 'S'.
Bake in the preheated oven until golden.

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.

Sugar + vanillatop 8% of all pairs

Smell alikelow

Cooked together35,032 recipes

Shared aroma: beta-damascenone (apple, rose).
Butter + flourtop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

Shared aroma: isobutyraldehyde (malty, green).
Flour + vanillatop 12% of all pairs

Smell alikemoderate

Cooked together19,241 recipes

Shared aroma: isobutyraldehyde (malty, green).
Butter + vanillatop 14% of all pairs

Smell alikemoderate

Cooked together20,050 recipes

Shared aroma: guaiacol (smoky, sweet).
Sugar + flourtop 15% of all pairs

Smell alikemoderate

Cooked together92,116 recipes

Shared aroma: phenylacetaldehyde (hawthorne, honey).

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

Egg yolks: Add richness and help bind the dough together.
Butter: Adds fat and richness, and creaming with sugar gives the dough a tender texture.
All-purpose flour: Provides the structure that holds the shaped dough together.
Powdered sugar: Sweetens the dough and dissolves easily into the creamed butter.