Why it works: Lemon and orange 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 ↓
Orange Filling
Ingredients
Directions
Make the orange syrup
Grate the yellow rind from the orange peel.
Combine the grated orange peel and ½ cup water in a saucepan.
Boil for 5 minutes and strain.
Add enough hot water to the strained liquid to make ½ cup.
Combine the ½ cup of liquid with 2 cups of sugar in a separate pot.
Boil until it spins a thread.
Finish the filling
Pour the syrup over the well-beaten egg yolks and beat until cool.
Add the juice of ½ orange and the juice of ½ lemon.
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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Lemon + orangetop 1% of all pairsSmell alikestrongCooked together10,634 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Lemon + sugartop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Egg + lemontop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Orange + sugartop 20% of all pairsSmell alikelowCooked together19,212 recipes
Shared aroma: beta-damascenone (apple, rose).
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Egg + sugartop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Lemon and sugar barely smell alike, yet cooks put them together in 53,532 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
- Egg yolks
- Thicken the filling and add richness when beaten with the hot syrup.
- Sugar
- Sweetens the filling and, boiled to a thread, gives it body.
- Lemon
- Adds acidity and bright flavour that balances the sweetness.
- Orange
- Supplies aromatic oil from the peel and fresh juice for flavour.
The step that matters
Pouring the syrup over the egg yolks. The syrup must be hot but poured slowly while beating, so the yolks warm gradually without scrambling. Beating until cool keeps the filling smooth and lets it set to a silky texture.
Swap the orange
How well each one fits the dish's main ingredients (egg, lemon, sugar):
- Orangethe original
- Vanillafits about as well
- Limefits less well
- Raisinfits less well
Fit is the average pairing score against egg, lemon, 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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