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Welsh Rarebit

A cheese sauce made with cheese, butter, egg, mustard, brandy, salt, pepper, served over hot toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 8 ingredients
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Why it works: Cheese and butter 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

  1. Melt the cheese and butter in a pan over low heat, stirring constantly.

  2. Once thoroughly melted, add the beaten egg, mustard, and brandy; stir to combine.

  3. Pour the mixture over hot toast and serve immediately on a very hot dish.

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. Cheese + buttertop 8% of all pairs
    Smell alikemoderate
    Cooked together7,962 recipes

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

  2. Pepper + mustardtop 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. Butter + brandytop 15% of all pairs
    Smell alikemoderate
    Cooked together5,127 recipes

    Shared aroma: ethyl octanoate (fruity, wine).

  5. Butter + eggtop 17% of all pairs
    Smell alikemoderate
    Cooked together118,967 recipes

    Shared aroma: decanal (soap, orange peel).

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

What each ingredient does

Cheese
Melts into a rich, creamy sauce that forms the body of the topping.
Egg
Thickens the melted cheese as it heats and helps bind the sauce together.
Butter
Adds fat that keeps the melted cheese smooth and glossy.
Mustard
Adds sharp tanginess that balances the richness of the cheese.
Brandy
Adds aromatic depth to the sauce.

The step that matters

Adding the egg to the melted cheese. Egg proteins set with heat and can scramble or turn grainy if the mixture gets too hot. Keeping the heat low and stirring constantly lets the egg thicken the sauce smoothly.

Swap the mustard

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

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

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