Name: Sardine Toast
Ingredients: 8 smoked sardines; 2 ounces fresh butter; a sprinkling of cayenne pepper; 4 whole peppercorns; hot buttered toast; lemon

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 ↓

Sardine Toast

Ingredients

Directions

Prepare the sardine mixture

Remove the bones from the sardines and pound them in a mortar with the butter, cayenne pepper, and peppercorns.
Heat the mixture in a small pan until thoroughly warmed.

Serve

Spread the sardine mixture on rounds or squares of hot buttered toast.
Squeeze a little lemon over the top and serve.

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).
Butter + lemontop 16% of all pairs

Smell alikemoderate

Cooked together41,227 recipes

Shared aroma: 3-hexenal (apple, fruity).
Butter + peppertop 21% of all pairs

Smell alikemoderate

Cooked together85,593 recipes

Shared aroma: trans-2-nonenal (cardboard, fatty).

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

What each ingredient does

Smoked sardines: Provide the main flavour and the body of the spread once pounded.
Fresh butter: Adds richness and moisture, helping the pounded sardines form a smooth spread.
Hot buttered toast: Gives a crisp, warm base that holds the spread.

“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.