Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓
Welsh Rarebit
Ingredients
Directions
The book gives no oven temperature. The 400°F in the steps was added when the recipe was transcribed, as a starting point.
Make the cheese sauce
In a clean saucepan, combine the cheese, butter, and porter (or ale or milk).
Stir over medium heat until melted and creamy.
Season with black pepper and mustard to taste.
Assemble and serve
Pour the mixture over hot buttered toast in a fireproof dish.
Brown the surface in a hot oven (400 °F/200 °C) if desired.
Serve immediately to avoid overcooking.
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.
-
Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
-
Cheese + buttertop 8% of all pairsSmell alikemoderateCooked together7,962 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
Pepper + mustardtop 9% of all pairsSmell alikemoderateCooked together15,430 recipes
Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).
-
Cheese + milktop 10% of all pairsSmell alikemoderateCooked together4,426 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
-
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
- Cheese
- Melts into the sauce to give it its rich, creamy body and savoury flavour.
- Butter
- Adds fat that keeps the melted cheese smooth and glossy rather than grainy.
- Porter
- Adds liquid to loosen the melted cheese and a malty, aromatic depth of flavour.
- Dry english mustard
- Adds a sharp, pungent note that balances the richness of the cheese.
The step that matters
Stir over medium heat until melted and creamy. Cheese proteins toughen and separate into greasy, grainy clumps when overheated, so gentle medium heat and constant stirring keep the sauce smooth.
Swap the mustard
How well each one fits the dish's main ingredients (cheese, butter, milk, pepper):
- Potatofits better
- Capsicumfits better
- Tomatofits better
- Mustardthe original
Fit is the average pairing score against cheese, butter, milk, 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
Macaroni and Cheese102 recipes
Cheese Making50 recipes
Cheese Fritters34 recipes
Cheese Omelette31 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.