Name: Tongue Sandwiches
Ingredients: 1 pound cold boiled tongue; 1 tablespoon mustard; a little pepper; 1 hard-boiled egg yolk, mashed; 1 ounce butter; juice of 1 lemon; light biscuits

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 ↓

Tongue Sandwiches

Ingredients

Directions

Make the filling

Grate the cold boiled tongue.
In a bowl, mix the grated tongue with mustard, pepper, mashed egg yolk, butter, and lemon juice.

Assemble

Split the light biscuits and spread the mixture between them.

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).
Mustard + biscuittop 4% of all pairs

Smell alikestrong

Cooked together121 recipes

Shared aroma: coumarin (sweet, hay).
Mustard + peppertop 9% of all pairs

Smell alikemoderate

Cooked together15,430 recipes

Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Mustard + lemontop 11% of all pairs

Smell alikestrong

Cooked together3,816 recipes

Shared aroma: eucalyptol (eucalyptus, herbal).
Pepper + biscuittop 12% of all pairs

Smell alikemoderate

Cooked together841 recipes

Shared aroma: nonanal (fat, citrus).

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

What each ingredient does

Cold boiled tongue: Forms the main body of the filling and provides its savory meaty flavor.
Mustard: Adds sharp flavor that balances the richness of the meat and butter.
Hard-boiled egg yolk: Adds richness and helps the filling hold together as a spread.
Butter: Adds fat that makes the filling moist and smooth on the palate.
Lemon juice: Adds acidity that brightens the filling and cuts the fat.
Light biscuits: Provides a soft base that holds the filling between its halves.

Swap the mustard

How well each one fits the dish's main ingredients (pepper, egg, butter, lemon, biscuit):

Spinachfits better
Asparagusfits better
Arrowrootfits better
Mustardthe original

Fit is the average pairing score against pepper, egg, butter, lemon, biscuit. 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.