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Welsh Rarebit

A cheese sauce with mustard, cayenne, and egg, served over toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Cream and butter are a kitchen classic. They rank in the top 8% of all ingredient pairs, and cooks put them together in 41,516 recipes. Both carry delta-dodecalactone, which smells sweet, creamy. The science ↓

Welsh Rarebit

Ingredients

Directions

Make the sauce

  1. In a double boiler, combine the cheese and cream or milk.

  2. Mix the mustard, salt, and cayenne pepper in a separate bowl.

  3. Add the egg to the dry mixture and beat well.

  4. Once the cheese is melted, stir in the dry mixture and the egg, then add the butter.

  5. Cook until thickened, stirring constantly.

Serve

  1. Pour the mixture over the 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. Cream + buttertop 8% of all pairs
    Smell alikemoderate
    Cooked together41,516 recipes

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

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

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

  3. Pepper + mustardtop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

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

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

  5. Cheese + creamtop 15% of all pairs
    Smell alikemoderate
    Cooked together2,655 recipes

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

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

What each ingredient does

Grated cheese
Melts into the sauce and provides the main rich, savory flavor and body.
Cream or milk
Adds moisture so the melted cheese forms a smooth, pourable sauce.
Butter
Adds richness and helps the sauce feel smooth and glossy.
Mustard
Adds a sharp, tangy note that balances the richness of the cheese.

The step that matters

Cook until thickened, stirring constantly. Cheese proteins can tighten, turn grainy, or separate when overheated, so gentle heat and constant stirring keep the sauce smooth as it thickens.

Swap the mustard

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

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

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