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.
Make the cheese mixture
Mix the grated cheese with the egg yolks in a bowl.
Add the grated bread, butter, mustard, salt, and pepper, and mix well.
Prepare the toast
Toast the bread slices and remove the crusts.
Cut the toasted bread into shapes.
Bake and serve
Spread the cheese mixture thickly on top of the bread shapes.
Place the prepared bread in a 400°F (200°C) oven until hot and slightly browned.
Serve immediately while hot.
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 a rich, savoury sauce that gives the rarebit its main flavour and body.
- Egg yolks
- Bind the cheese mixture and help it set into a thick, spreadable topping.
- Grated bread
- Absorbs melted butter and cheese, adding body and helping the topping hold together.
- Butter
- Adds fat and richness, keeping the cheese mixture smooth and glossy.
- Made mustard
- Adds sharpness that balances the richness of the cheese and butter.
The step that matters
Baking until hot and slightly browned. Cheese mixtures can turn greasy or rubbery if overheated, while underheating leaves the topping cold and unset. Watching for a light golden colour and bubbling edges gives a smooth, lightly browned topping.
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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