Why it works: Lettuce and parsley match in chemistry and in kitchens. They rank in the top 5% of all ingredient pairs, and cooks put them together in 1,483 recipes. Both carry trans-2-hexenal, which smells green, leafy. The science ↓
A Popular Sandwich
Ingredients
Directions
Prepare the bread
Cut the bread into ½ inch thick slices and remove the crusts.
Toast half of the slices delicately and spread a thin layer of butter on them.
Cook the bacon
Broil the bacon until crispy and cut into thin slices.
Assemble and serve
On the plain bread, layer the bacon, lettuce, mayonnaise, and sliced chicken.
Top with a toasted slice of bread.
Serve on lettuce leaves, garnished with parsley, or on a doily without garnish.
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.
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Lettuce + parsleytop 5% of all pairsSmell alikestrongCooked together1,483 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Bread + buttertop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Bread + chickentop 14% of all pairsSmell alikemoderateCooked together2,258 recipes
Shared aroma: ethyl caproate (fruity).
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Butter + parsleytop 15% of all pairsSmell alikemoderateCooked together28,563 recipes
Shared aroma: trans-2-hexenal (green, leafy).
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Bread + lettucetop 15% of all pairsSmell alikemoderateCooked together602 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
- Bacon
- Adds salty, smoky flavour and a crisp texture to the sandwich.
- Mayonnaise dressing
- Adds moisture and richness that keeps the chicken and bread from drying out.
- Sliced cold chicken
- Provides the main protein and the bulk of the sandwich filling.
- Bread
- Forms the structure that holds the layered filling together.
- Butter
- Adds fat and flavour to the toasted bread and helps it brown.
Swap the parsley
The recipe marks parsley as optional. How well each one fits the dish's main ingredients (bread, butter, lettuce, chicken):
- Capersfits better
- Tarragonfits better
- Garlicfits about as well
- Parsleythe original
Fit is the average pairing score against bread, butter, lettuce, chicken. 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.
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