Why it works: Orange and lemon match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 10,634 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓
Portsmouth Orange 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 the orange and flour
Grate the rind of an orange and squeeze the juice of half an orange over the grated rind.
Add tartaric acid and let the mixture sit for 30 minutes.
Mix baking powder with sifted flour, sift three times, and set aside.
Make and bake the cake
In a bowl, beat the yolks of the eggs with granulated sugar until light.
Add the lemon juice and grated rind, then beat again.
Fold in the flour mixture and the stiffly beaten egg whites.
Bake in two layers at 350°F (175°C).
Ice and serve
For icing, mix confectioner's sugar with the prepared orange juice.
Adjust icing consistency with more juice or sugar as needed.
Layer the cakes with thinly sliced sweet oranges and cover with icing.
Serve within 1-2 hours for best taste.
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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Orange + lemontop 1% of all pairsSmell alikestrongCooked together10,634 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Flour + sugartop 15% of all pairsSmell alikemoderateCooked together92,116 recipes
Shared aroma: phenylacetaldehyde (hawthorne, honey).
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Flour + eggtop 15% of all pairsSmell alikelowCooked together106,462 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Flour + lemontop 17% of all pairsSmell alikemoderateCooked together30,404 recipes
Shared aroma: isobutyraldehyde (malty, green).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
Flour and egg 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
- Whites are beaten to foam for lift, and yolks add richness and structure to the crumb.
- Baking powder
- Releases gas in the batter to make the cake rise and become light.
- Tartaric acid
- Acidifies the orange mixture, sharpening flavour and reacting with leavening to aid rise.
- Flour
- Provides the structure that holds the cake's crumb once baked.
- Granulated sugar
- Sweetens the batter and, when beaten with yolks, helps create a light, airy texture.
- Confectioner's sugar
- Forms a sweet, smooth icing that sets over the cake's surface.
The step that matters
Folding in the egg whites. Stiffly beaten whites hold air that makes the cake light. Folding gently keeps that air in; stirring hard deflates the foam and yields a dense cake.
Swap the orange
How well each one fits the dish's main ingredients (flour, egg, sugar, lemon):
- Raisinfits better
- Vanillafits better
- Orangethe original
- Blueberryfits about as well
Fit is the average pairing score against flour, egg, sugar, lemon. 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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