Why it works: Cinnamon and lemon match in chemistry and in kitchens. They rank in the top 7% of all ingredient pairs, and cooks put them together in 7,950 recipes. Both carry beta-phellandrene, which smells minty, terpene. The science ↓
Chocolate Squares
Ingredients
Directions
The book says “a moderate oven”. The 350°F (175°C) in the steps is the modern equivalent, not the book's own figure.
Prepare the batter
Preheat the oven to 350°F (175°C).
Mix the flour, grated chocolate, baking powder, and cinnamon together.
Separate the eggs. Beat the yolks with the powdered sugar until very light.
Add the lemon juice and rind to the yolks and beat well.
Incorporate the dry ingredients into the yolk mixture.
Fold in the stiffly beaten egg whites.
Bake and finish
Pour the batter into shallow square cake pans.
Bake for 20 to 30 minutes until set.
Once cooled, spread cream filling or jelly between layers.
Ice with chocolate icing and cut into squares once hardened.
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.
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Cinnamon + lemontop 7% of all pairsSmell alikestrongCooked together7,950 recipes
Shared aroma: beta-phellandrene (minty, terpene).
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Flour + cinnamontop 9% of all pairsSmell alikemoderateCooked together17,341 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Cinnamon + sugartop 10% of all pairsSmell alikelowCooked together30,779 recipes
Shared aroma: guaiacol (smoky, sweet).
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Chocolate + cinnamontop 12% of all pairsSmell alikemoderateCooked together1,808 recipes
Shared aroma: ethyl cinnamate (sweet, balsamic).
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Chocolate + sugartop 13% of all pairsSmell alikemoderateCooked together15,404 recipes
Shared aroma: guaiacol (smoky, sweet).
Cinnamon and sugar barely smell alike, yet cooks put them together in 30,779 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
- Whipped whites give the batter lift and an airy, light structure as they set in the oven.
- Flour
- Provides the structure that holds the cake together once the egg foam has set.
- Powdered sugar
- Beaten with the yolks to create a light, fine-textured base and add sweetness.
- Grated chocolate
- Adds chocolate flavor and color to the batter.
- Baking powder
- Releases gas during baking to help the squares rise.
The step that matters
Folding in the egg whites. Stiffly beaten whites hold the air that lightens the batter. Stirring them in hard or too long deflates that foam, leaving dense squares, so fold gently until just combined.
Swap the lemon
How well each one fits the dish's main ingredients (chocolate, flour, cinnamon, egg, sugar):
- Vanillafits better
- Raisinfits better
- Figfits better
- Lemonthe original
Fit is the average pairing score against chocolate, flour, cinnamon, egg, sugar. 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.
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