Name: Blue Grass Cake
Ingredients: 9 eggs; 2 cups sugar; 3½ cups flour; ½ cup water or milk; 1 cup butter; 3 teaspoons baking powder

Why it works: Milk and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Blue Grass 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 batter

Beat the egg whites and sugar together until well combined.
Add the water or milk to the mixture.
Sift in the flour and baking powder, then mix well.
Cream the butter and fold it into the batter.
Add flavoring as desired.

Bake

Pour the batter into a greased cake pan and bake 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.

Milk + buttertop 7% of all pairs

Smell alikemoderate

Cooked together81,283 recipes

Shared aroma: (z)-4-heptenal (biscuit, cream).
Flour + buttertop 12% of all pairs

Smell alikelow

Cooked together124,287 recipes

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

Smell alikelow

Cooked together78,219 recipes

Shared aroma: isobutyraldehyde (malty, green).
Sugar + flourtop 15% of all pairs

Smell alikemoderate

Cooked together92,116 recipes

Shared aroma: phenylacetaldehyde (hawthorne, honey).
Egg + flourtop 15% of all pairs

Smell alikelow

Cooked together106,462 recipes

Shared aroma: isobutyraldehyde (malty, green).

Flour and butter 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: Egg whites beaten with sugar trap air and give the cake its structure.
Flour: Provides the starch and protein that set into the cake's structure as it bakes.
Sugar: Adds sweetness and helps the beaten egg mixture hold air.
Butter: Adds fat that makes the crumb tender and rich.
Baking powder: Releases gas in the batter so the cake rises.
Water or milk: Adds moisture that hydrates the flour and keeps the crumb soft.

“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.