Why it works: Mustard and lettuce match in chemistry and in kitchens. They rank in the top 1% of all ingredient pairs, and cooks put them together in 1,356 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓
Roast Beef Sandwiches
Ingredients
Directions
Assemble
Spread mustard or mayonnaise on a slice of bread.
Layer slices of roast beef on top.
Add lettuce if desired.
Top with another slice of bread.
Serve
Cut into halves or quarters for serving.
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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Mustard + lettucetop 1% of all pairsSmell alikestrongCooked together1,356 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Beef + breadtop 13% of all pairsSmell alikemoderateCooked together4,032 recipes
Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
-
Bread + lettucetop 15% of all pairsSmell alikemoderateCooked together602 recipes
Shared aroma: nonanal (fat, citrus).
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Bread + mustardtop 16% of all pairsSmell alikemoderateCooked together1,484 recipes
Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).
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Beef + mustardtop 17% of all pairsSmell alikemoderateCooked together1,664 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs
What each ingredient does
- Slices of roast beef
- Provides the main protein and bulk of the sandwich filling.
- Bread of choice
- Provides the structure that holds the filling together.
- Mustard or mayonnaise
- Adds moisture and a sharp or creamy flavour that carries through the sandwich.
Swap the lettuce
The recipe marks lettuce as optional. How well each one fits the dish's main ingredients (beef, bread, mustard):
- Horseradishfits better
- Shallotfits about as well
- Lettucethe original
- Chivefits about as well
Fit is the average pairing score against beef, bread, mustard. 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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