Name: Lemon Tarts
Ingredients: juice and grated rind of 2 lemons; ⅔ cup sugar; 2 eggs; crumbs of stale bread; pastry for lining

Why it works: Egg and bread are a kitchen classic. They rank in the top 13% of all ingredient pairs, and cooks put them together in 22,662 recipes. Both carry (e)-2-octenal, which smells fatty, green. 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.

Prepare

Preheat the oven to 350°F (175°C).

Make and fill

In a bowl, beat together the lemon juice, lemon rind, sugar, eggs, and stale bread crumbs until smooth.
Line small tins with pastry and pour the lemon mixture into them.

Bake

Bake until the crust is cooked.

Recipe from a historical cookbook (Internet Archive).

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.

Egg + breadtop 13% of all pairs

Smell alikemoderate

Cooked together22,662 recipes

Shared aroma: (e)-2-octenal (fatty, green).
Lemon + sugartop 18% of all pairs

Smell alikelow

Cooked together53,532 recipes

Shared aroma: 2-nonenal (fatty, green).
Lemon + eggtop 19% of all pairs

Smell alikelow

Cooked together44,316 recipes

Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).
Lemon + breadtop 20% of all pairs

Smell alikemoderate

Cooked together8,445 recipes

Shared aroma: 2-nonenal (fatty, green).
Sugar + eggtop 21% of all pairs

Smell alikemoderate

Cooked 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

Eggs: Bind the filling and help it set firm when baked.
Sugar: Sweetens the filling and balances the sharpness of the lemon.
Lemon juice: Provides the acidity and bright flavour of the filling.
Stale bread crumbs: Absorb liquid and thicken the filling so it holds its body.