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Welsh Rarebit

A cheese sauce made with American cheese, beer, salt, mustard, and red pepper, served over buttered toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 ingredients
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Why it works: Mustard and pepper are a kitchen classic. They rank in the top 9% of all ingredient pairs, and cooks put them together in 15,430 recipes. Both carry 2-isopropyl-3-methoxypyrazine, which smells earthy, pea. The science ↓

Welsh Rarebit

Ingredients

Directions

Make the cheese sauce

  1. Heat the beer in a chafing dish until hot.

  2. Add the cheese, salt, mustard, and red pepper.

  3. Stir until the mixture is perfectly smooth.

Serve

  1. Serve immediately on hot buttered 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. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

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

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

  3. Beer + mustardtop 11% of all pairs
    Smell alikemoderate
    Cooked together314 recipes

    Shared aroma: guaiacol (smoky, sweet).

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

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

  5. Beer + peppertop 16% of all pairs
    Smell alikemoderate
    Cooked together940 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

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

What each ingredient does

American cheese
Melts into a smooth, creamy sauce that gives the rarebit its body and flavor.
Beer
Thins the melted cheese and adds a subtle malty flavor to the sauce.
Dry mustard
Adds sharp, pungent flavor that balances the richness of the cheese.

The step that matters

Stir until perfectly smooth. Cheese can turn grainy or stringy if it is overheated or melted too fast. Heating gently while stirring lets the proteins and fat emulsify into a uniform sauce.

Swap the mustard

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

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

Fit is the average pairing score against cheese, beer, 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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