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Welsh Rarebit

A savory cheese sauce made with butter, cheese, mustard, cayenne, and beer, served hot over toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Butter and cheese are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 7,962 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓

Welsh Rarebit

Ingredients

Directions

Make the rarebit

  1. Melt the butter in a chafing dish.

  2. Add the diced cheese, dry mustard, and cayenne pepper.

  3. Stir continuously and gradually add the beer to prevent burning. Continue adding beer until you have used about ½ pint.

Serve

  1. Serve the mixture hot over toast.

Recipe from a historical cookbook (Internet Archive).

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.

  1. Butter + cheesetop 8% of all pairs
    Smell alikemoderate
    Cooked together7,962 recipes

    Shared aroma: delta-dodecalactone (sweet, creamy).

  2. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  3. Cheese + mustardtop 11% of all pairs
    Smell alikemoderate
    Cooked together1,805 recipes

    Shared aroma: 2-isopropyl-3-methoxypyrazine (earthy, pea).

  4. Mustard + beertop 11% of all pairs
    Smell alikemoderate
    Cooked together314 recipes

    Shared aroma: guaiacol (smoky, sweet).

  5. Cheese + beertop 11% of all pairs
    Smell alikemoderate
    Cooked together174 recipes

    Shared aroma: 5-ethyl-3-hydroxy-4-methyl-2(5h)-furanone (spice).

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Fresh cheese
Melts into a smooth, rich sauce that forms the body of the rarebit.
Beer
Thins the melted cheese into a pourable sauce and adds a slightly bitter, malty flavour.
Butter
Melts first to coat the pan and add richness to the cheese mixture.
Dry mustard
Adds a sharp, pungent note that balances the richness of the cheese.

The step that matters

Adding the beer gradually while stirring. Cheese proteins and fat can seize, turn grainy, or scorch when heated too fast or unevenly. Adding beer slowly while stirring keeps the mixture loose and evenly heated, so it becomes smooth rather than burnt or stringy.

Swap the mustard

How well each one fits the dish's main ingredients (butter, cheese, pepper, beer):

  1. Capsicumfits about as well
  2. Mustardthe original
  3. Potatofits about as well
  4. Tomatofits about as well

Fit is the average pairing score against butter, cheese, pepper, beer. 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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