Name: Water Cress Sandwiches
Ingredients: water cress; hard-boiled eggs, chopped fine; coarse sea salt; black pepper; stale loaf of bread; fresh butter; lemon juice

Why it works: Pepper and lemon match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 27,047 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Water Cress Sandwiches

Ingredients

Directions

Wash the water cress and dry it thoroughly, pressing out all moisture.
Mix the chopped hard-boiled eggs with salt and pepper.
Slice the stale loaf into thin slices for two dozen sandwiches.
Cut the water cress into small pieces, removing the stems.
Spread butter on each slice of bread, add the cress mixture, and sprinkle with lemon juice.
Press the slices together firmly and cut into small squares, removing the crust.

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.

Pepper + lemontop 3% of all pairs

Smell alikestrong

Cooked together27,047 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).
Bread + buttertop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Egg + breadtop 13% of all pairs

Smell alikemoderate

Cooked together22,662 recipes

Shared aroma: (e)-2-octenal (fatty, green).
Butter + lemontop 16% of all pairs

Smell alikemoderate

Cooked together41,227 recipes

Shared aroma: 3-hexenal (apple, fruity).
Pepper + breadtop 16% of all pairs

Smell alikemoderate

Cooked together20,964 recipes

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