Name: French Sandwiches
Ingredients: ¼ pound tongue, minced; ¼ pound ham, minced; 2 tablespoons butter; 3 truffles, minced; paprika, to taste; a few drops lemon juice; 5 drops onion juice; thin slices of bread; watercress leaves

Why it works: Lemon and watercress match in chemistry and in kitchens. They rank in the top 3% of all ingredient pairs, and cooks put them together in 579 recipes. Both carry coumarin, which smells sweet, hay. The science ↓

French Sandwiches

Ingredients

Directions

Prepare the filling

In a bowl, mix the minced tongue and ham with butter and minced truffles until it forms a paste.
Season the mixture with paprika, lemon juice, and onion juice.

Assemble the sandwich

Spread the mixture between two slices of bread.
Add a few watercress leaves on top of the mixture before closing the sandwich.

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 + watercresstop 3% of all pairs

Smell alikestrong

Cooked together579 recipes

Shared aroma: coumarin (sweet, hay).
Butter + breadtop 7% of all pairs

Smell alikemoderate

Cooked together27,232 recipes

Shared aroma: delta-decalactone (sweet, creamy).
Ham + breadtop 7% of all pairs

Smell alikemoderate

Cooked together2,536 recipes

Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
Onion + watercresstop 9% of all pairs

Smell alikestrong

Cooked together533 recipes

Shared aroma: coumarin (sweet, hay).
Butter + truffletop 11% of all pairs

Smell alikemoderate

Cooked together2,209 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

Tongue: Provides the main meaty body and bulk of the filling.
Ham: Adds savory, salty flavor and extra body to the paste.
Butter: Adds fat and richness, helping bind the minced meats into a smooth paste.
Truffles: Contribute a deep, earthy aroma that defines the dish.

Swap the lemon

How well each one fits the dish's main ingredients (ham, butter, truffle, onion, bread, watercress):

Avocadofits about as well
Lemonthe original
Red currantfits about as well
Pumpkinfits about as well

Fit is the average pairing score against ham, butter, truffle, onion, bread, watercress. 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.