Why it works: Bread and butter are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓
Welsh Rarebit
Ingredients
Directions
The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.
Prepare the topping
Preheat the oven to 400°F (200°C).
In a bowl, mix the grated cheese, egg yolks, grated bread, butter, mustard, salt, and pepper until well combined.
Assemble and bake
Toast the slices of bread and remove the crusts.
Cut the toasted bread into shapes and spread the cheese mixture thickly on top.
Place the prepared bread in the oven and bake until hot and slightly browned.
Serve immediately.
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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Bread + buttertop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Cheese + breadtop 7% of all pairsSmell alikemoderateCooked together2,130 recipes
Shared aroma: delta-decalactone (sweet, creamy).
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Cheese + buttertop 8% of all pairsSmell alikemoderateCooked together7,962 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
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Cheese + mustardtop 11% of all pairsSmell alikemoderateCooked together1,805 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
- Dry cheese
- Melts into the mixture and provides the rich, savory flavor of the topping.
- Egg yolks
- Bind the cheese mixture and help it set into a smooth, cohesive topping.
- Grated bread
- Adds body to the topping and helps thicken the cheese mixture.
- Butter
- Adds fat for a smoother texture and richer flavor in the topping.
- Made mustard
- Adds sharpness that balances the richness of the cheese and butter.
The step that matters
Bake until hot and slightly browned. Egg yolks in the topping can curdle or overcook if the oven runs too hot or too long, so watch for a hot, lightly browned surface rather than letting it dry out.
Swap the mustard
How well each one fits the dish's main ingredients (cheese, egg, bread, butter, pepper):
- Capsicumfits better
- Asparagusfits about as well
- Potatofits about as well
- Mustardthe original
Fit is the average pairing score against cheese, egg, bread, butter, pepper. 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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