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 topping
In a mortar, mix the grated cheese with the egg yolks, grated bread, and butter.
Add the mustard, salt, and pepper, and beat the mixture until well combined.
Assemble and bake
Toast the slices of bread and remove the crusts.
Cut the bread into shapes and spread the cheese mixture thickly on top.
Place the prepared bread in a 400°F (200°C) oven until hot and slightly browned.
Serve
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.
-
Bread + buttertop 7% of all pairsSmell alikemoderateCooked together27,232 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Cheese + breadtop 7% of all pairsSmell alikemoderateCooked together2,130 recipes
Shared aroma: delta-decalactone (sweet, creamy).
-
Cheese + buttertop 8% of all pairsSmell alikemoderateCooked together7,962 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Mustard + peppertop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
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 sauce and gives the topping its rich, savoury flavour.
- Egg yolks
- Emulsify with the butter and set when heated, binding the topping and making it creamy.
- Grated bread
- Thickens the mixture and adds body so it spreads rather than running off the toast.
- Butter
- Adds fat for smooth texture and helps the topping melt and brown evenly.
- Made mustard
- Adds sharp, acidic bite that balances the richness of the cheese and egg.
The step that matters
Baking until hot and slightly browned. Egg yolks set and the cheese melts within a short time in a hot oven; overbaking can make the topping tough or oily and dry, while underbaking leaves it cold and runny.
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.
More welsh rarebit recipes
You might also like
Brown Bread461 recipes
Macaroni and Cheese102 recipes
White Bread80 recipes
Bread Omelette60 recipesThe free Flavor Lab newsletter: one surprising pairing a week and the molecular reason it works, in 60 seconds. No spam, unsubscribe anytime.
Prefer an account? Create a free account to save pairings and unlock the full chemistry.