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Welsh Rarebit

A cheese sauce made with milk, mustard, and spices, served over toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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

Prepare

  1. Break the cheese into small pieces or grate it if hard.

  2. Combine the cheese and milk in a double boiler.

  3. Mix the mustard, salt, and cayenne pepper or Worcestershire sauce.

  4. Add the egg to the mixture and beat well.

Make the rarebit

  1. When the cheese is melted, stir in the egg mixture and cook until it thickens, stirring constantly.

  2. Pour the cheese mixture over the slices of 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 + milktop 10% of all pairs
    Smell alikemoderate
    Cooked together4,426 recipes

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

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

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

  4. Cheese + peppertop 18% of all pairs
    Smell alikemoderate
    Cooked together7,861 recipes

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

  5. Milk + eggtop 18% of all pairs
    Smell alikemoderate
    Cooked together88,785 recipes

    Shared aroma: 2-nonenal (fatty, green).

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 and sets body and flavor as it cooks.
Egg
Thickens the cheese sauce as it cooks, giving it a creamy, spoonable texture.
Milk
Loosens the melted cheese into a pourable sauce that coats the toast.
Mustard
Adds sharp, tangy flavor that balances the richness of the cheese.

The step that matters

Cook the egg mixture until it thickens. Egg proteins set when heated, so the sauce thickens. Stirring constantly and keeping the heat gentle prevents the egg from scrambling or curdling in the hot cheese.

Swap the mustard

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

  1. Capsicumfits better
  2. Potatofits better
  3. Asparagusfits better
  4. Mustardthe original

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