Name: Sardine Sandwich
Ingredients: boneless sardines; ½ lemon (juiced); mayonnaise dressing; bread (thinly sliced); cucumbers (thinly sliced); French dressing

Why it works: Lemon and cucumber match in chemistry and in kitchens. They rank in the top 9% of all ingredient pairs, and cooks put them together in 2,067 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Sardine Sandwich

Ingredients

Directions

Prepare

Mash the boneless sardines in a bowl.
Add the juice of ½ lemon and enough mayonnaise dressing to create a smooth paste.

Assemble

Spread the sardine mixture between thin layers of bread.
Top the sardines with thin slices of cucumbers that have been marinated in French dressing.

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.

Lemon + cucumbertop 9% of all pairs

Smell alikestrong

Cooked together2,067 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Bread + cucumbertop 16% of all pairs

Smell alikemoderate

Cooked together344 recipes

Shared aroma: 2-nonenal (fatty, green).
Lemon + breadtop 20% of all pairs

Smell alikemoderate

Cooked together8,445 recipes

Shared aroma: 2-nonenal (fatty, green).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Boneless sardines: Provide the main filling and rich, savory flavor.
Mayonnaise dressing: Binds the mashed sardines into a smooth, spreadable paste and adds moisture.
Lemon juice: Adds acidity that brightens the rich fish flavor.
Cucumbers: Add cool, crisp texture and fresh moisture against the filling.