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Welsh Rarebit

A cheese sauce with butter, mustard, pepper, salt, and old ale, served over toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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. In a chafing dish, combine the cheese, butter, mustard, pepper, salt, and old ale.

  2. Stir constantly until the cheese is completely melted.

  3. Serve the mixture 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. Cheese + buttertop 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. Cheese + peppertop 18% of all pairs
    Smell alikemoderate
    Cooked together7,861 recipes

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

  5. Butter + peppertop 21% of all pairs
    Smell alikemoderate
    Cooked together85,593 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

Cheese
Melts into a smooth, creamy sauce that carries the flavor of the dish.
Butter
Adds fat that keeps the melted cheese smooth and glossy rather than stringy.
Old ale
Thins the cheese mixture and adds a malty, slightly bitter depth of flavor.
Mustard
Adds sharp, tangy flavor that balances the richness of the cheese.

The step that matters

Stir constantly until the cheese is completely melted. Cheese proteins tighten and turn grainy or oily when overheated or left unstirred, so gentle, constant stirring over low heat keeps the sauce smooth.

Swap the mustard

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

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

Fit is the average pairing score against cheese, butter, 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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