Name: Custard Cake
Ingredients: 1 cup sugar; 3 eggs; 4 tablespoons sour cream; ½ teaspoon baking soda; 1½ cups flour

Why it works: Sugar and cream are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 43,450 recipes. Both carry 2,3-butanedione, which smells butter, sweet. The science ↓

Custard 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

In a bowl, mix the sugar, eggs, sour cream, and baking soda.
Gradually stir in the flour until well combined.
Pour the batter into jelly tins.

Bake and serve

Bake until golden brown.
Allow to cool 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.

Sugar + creamtop 9% of all pairs

Smell alikemoderate

Cooked together43,450 recipes

Shared aroma: 2,3-butanedione (butter, sweet).
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).
Cream + flourtop 20% of all pairs

Smell alikemoderate

Cooked together30,481 recipes

Shared aroma: acetaldehyde (pungent, ethereal).
Sugar + eggtop 21% of all pairs

Smell alikemoderate

Cooked together122,807 recipes

Shared aroma: 2-nonenal (fatty, green).

Egg and flour barely smell alike, yet cooks put them together in 106,462 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: Provide structure and richness, setting the cake as they cook.
Flour: Forms the main structure of the cake as its proteins set during baking.
Sugar: Adds sweetness and helps the cake brown as it bakes.
Baking soda: Reacts with the acidity of the sour cream to produce gas that lifts the batter.
Sour cream: Adds moisture and tenderness, and its acidity activates the baking soda.

“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.