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
Melt the cheese
In a chafing dish or saucepan, warm the butter over low heat.
Add the sliced cheese and melt slowly, stirring occasionally.
Once the cheese is half melted, stir steadily until fully melted and smooth.
Finish and serve
Slowly pour in the Worcestershire sauce, mustard, salt, and Tabasco, stirring rapidly to combine.
Quickly add the baking soda and stir until well blended.
Serve immediately on warm bread or toast.
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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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).
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Sauce + mustardtop 13% of all pairsSmell alikemoderateCooked together2,120 recipes
Shared aroma: ethanol (alcoholic, ethereal).
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 and provides the main body, richness, and savory flavor.
- Butter
- Adds fat that helps the cheese melt smoothly and gives the sauce a rich mouthfeel.
- Milk
- Provides the liquid that loosens the melted cheese into a smooth, pourable sauce.
- Worcestershire sauce
- Adds acidity and savory depth that balances the richness of the cheese.
- Mustard
- Adds sharpness that cuts through the richness of the cheese and butter.
- Baking soda
- Raises the pH of the cheese, helping it melt smoothly instead of turning stringy or greasy.
The step that matters
Melting the cheese slowly over low heat. Overheated cheese proteins tighten and squeeze out fat, leaving the sauce grainy or oily. Melting gently over low heat keeps the emulsion smooth.
Swap the mustard
How well each one fits the dish's main ingredients (cheese, sauce, butter, milk):
- Potatofits better
- Tomatofits about as well
- Capsicumfits about as well
- Mustardthe original
Fit is the average pairing score against cheese, sauce, butter, milk. 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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