Name: Royal Chocolate Layer Cake
Ingredients: 1 egg; Royal Baking Powder; chocolate filling; chocolate icing

Why it works: Egg and chocolate are a kitchen classic. They rank in the top 24% of all ingredient pairs, and cooks put them together in 11,448 recipes. Both carry 2-heptenal, which smells green. The science ↓

Royal Chocolate Layer Cake

Ingredients

1 egg
Royal Baking Powder
chocolate filling
chocolate icing

Directions

Prepare

Prepare the cake batter using one egg and Royal Baking Powder.

Bake and assemble

Bake until light and tender.
Fill the cake with the chocolate filling.
Ice the top and sides with chocolate icing, using only half the quantity.

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.

Egg + chocolatetop 24% of all pairs

Smell alikemoderate

Cooked together11,448 recipes

Shared aroma: 2-heptenal (green).

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

What each ingredient does

Egg: Adds structure and richness to the batter, helping it set and hold together when baked.
Royal baking powder: Releases gas in the batter, helping the cake rise and turn light and tender.
Chocolate filling: Adds flavour and moisture between the cake layers.
Chocolate icing: Adds sweetness and a smooth chocolate coating to the top and sides.

“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.