Why it works: Lemon and butter are a kitchen classic. They rank in the top 16% of all ingredient pairs, and cooks put them together in 41,227 recipes. Both carry 3-hexenal, which smells apple, fruity. The science ↓
Lemon Tarts
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.
Make the filling
Boil the water.
Stir in the cornflour mixed with a little cold milk, butter, and sugar.
Once cooled, add the egg yolks and lemon juice and rind.
Pour the mixture into a tart shell.
Bake and top with meringue
Bake in a moderate oven at 350°F (175°C).
Whip the egg whites with 2 tablespoons of water and 2 tablespoons of sugar until stiff.
Spread the meringue over the tart when it is nearly done.
Return to the oven to set.
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 + buttertop 16% of all pairsSmell alikemoderateCooked together41,227 recipes
Shared aroma: 3-hexenal (apple, fruity).
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Egg + buttertop 17% of all pairsSmell alikemoderateCooked together118,967 recipes
Shared aroma: decanal (soap, orange peel).
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Sugar + buttertop 17% of all pairsSmell alikemoderateCooked together98,233 recipes
Shared aroma: guaiacol (smoky, sweet).
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Lemon + sugartop 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).
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 and a smooth, custard-like texture.
- Cornflour
- Thickens the filling as it heats, giving it a firm, sliceable set.
- Sugar
- Sweetens the filling and helps stabilise the meringue.
- Lemon
- Provides the tart acidity and bright aroma from the juice and grated rind.
- Egg whites
- Whip into a foam that sets into the light, browned meringue topping.
The step that matters
Spread the meringue over the tart when it is nearly done. Meringue needs to be whipped until stiff and then baked briefly until set and lightly browned. Adding it too early lets it sink or weep, while adding it too late leaves it pale and under-set.
Swap the lemon
How well each one fits the dish's main ingredients (sugar, egg, butter):
- Vanillafits better
- Lemonthe original
- Raisinfits about as well
- Figfits about as well
Fit is the average pairing score against sugar, egg, butter. 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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