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
Prepare
Grate the cheese or cut it into small pieces.
Make the sauce
In a saucepan, stir together the cheese, butter, mustard, milk or ale, pepper, and salt over low heat until melted and smooth.
Serve
Serve the mixture over toast.
Optional: Top with poached eggs if desired.
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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Butter + milktop 7% of all pairsSmell alikemoderateCooked together81,283 recipes
Shared aroma: (z)-4-heptenal (biscuit, cream).
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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 + milktop 10% of all pairsSmell alikemoderateCooked together4,426 recipes
Shared aroma: delta-dodecalactone (sweet, creamy).
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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
- Cheese
- Melts into a smooth sauce that gives the rarebit its rich flavour and body.
- Butter
- Adds fat that makes the melted cheese sauce smooth and glossy.
- Milk or ale
- Adds liquid that loosens the cheese so it melts into a pourable sauce.
- Mustard
- Adds sharp, tangy flavour that balances the richness of the cheese.
The step that matters
Melt the cheese over low heat. High heat can make cheese tight, grainy or oily as its proteins seize and fat separates. Low, gentle heat lets the cheese melt evenly into a smooth sauce.
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.
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