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Welsh Rarebit

A cheese and mustard sauce served over toasted bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Butter and bread are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 27,232 recipes. Both carry delta-decalactone, which smells sweet, creamy. The science ↓

Welsh Rarebit

Oven, in the book's wordsA hot oven

Ingredients

Directions

Prepare the topping

  1. Cut the cheese into thin slices.

  2. Mix mustard with butter until creamy.

  3. Add cayenne to the butter mixture.

Assemble and cook

  1. Butter the toast and layer half the cheese on it.

  2. Pour half the butter mixture over the cheese, then add more cheese and the remaining butter.

  3. Place in a Dutch oven in front of the fire until the cheese melts.

Serve

  1. Serve immediately.

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. Butter + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

  2. Cheese + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together2,130 recipes

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

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

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

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

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

  5. Mustard + breadtop 16% of all pairs
    Smell alikemoderate
    Cooked together1,484 recipes

    Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).

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

What each ingredient does

Double gloucester cheese
Melts into a smooth, stretchy sauce that forms the body of the rarebit.
Butter
Adds fat and moisture, helping the cheese melt smoothly and stay creamy.
Mustard
Adds sharp, tangy flavour that balances the richness of the cheese.
Toasted bread
Provides a crisp, sturdy base that holds the melted topping.

The step that matters

Melting the cheese. Cheese turns grainy or greasy if overheated, because high heat tightens its proteins and separates the fat. Gentle, steady heat in front of the fire lets it melt evenly into a smooth sauce.

Swap the mustard

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

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

Fit is the average pairing score against cheese, butter, bread. 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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