Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓
Fruit Turnovers
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare
Preheat the oven to 400°F (200°C).
Peel, core, and slice the apples.
Roll out the puff pastry to about 1 inch thick and cut into circular pieces.
Fill and seal
Place the sliced apples on one half of each pastry circle, sprinkle with sugar, and add lemon juice.
Wet the edges of the pastry, fold it over, and press the edges to seal.
Bake and finish
Brush the tops with egg white and sprinkle with sifted sugar.
Bake on a baking sheet for about 20 minutes until golden brown.
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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Apple + lemontop 14% of all pairsSmell alikemoderateCooked together7,551 recipes
Shared aroma: trans-2-nonenal (cardboard, fatty).
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Apple + sugartop 18% of all pairsSmell alikelowCooked together16,478 recipes
Shared aroma: beta-damascenone (apple, rose).
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Sugar + lemontop 18% of all pairsSmell alikelowCooked together53,532 recipes
Shared aroma: 2-nonenal (fatty, green).
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Lemon + eggtop 19% of all pairsSmell alikelowCooked together44,316 recipes
Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
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Sugar + eggtop 21% of all pairsSmell alikemoderateCooked together122,807 recipes
Shared aroma: 2-nonenal (fatty, green).
Apple and sugar barely smell alike, yet cooks put them together in 16,478 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
- Puff pastry
- Its layers puff and turn flaky and crisp as the fat melts and steam lifts them in the oven.
- Apples
- They soften and release moisture, forming the soft, sweet filling inside the pastry.
- Sugar
- Sweetens the filling and helps the exposed sugar on top caramelise to a golden finish.
- Egg white
- Brushed on top, it promotes browning and gives the sprinkled sugar a glossy, crisp finish.
- Lemon juice
- Adds acidity that brightens the apple flavour and helps keep the apple slices from browning.
The step that matters
Sealing the edges. If the edges are not wetted and pressed firmly, steam from the juicy apples can force the pastry open during baking, letting the filling leak out and the turnover lose its shape.
Swap the apple
How well each one fits the dish's main ingredients (sugar, lemon, egg):
- Orangefits better
- Vanillafits better
- Limefits better
- Applethe original
Fit is the average pairing score against sugar, lemon, egg. 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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