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Welsh Rarebit

A cheese sauce made with butter, mustard, and cream, served over toasted crackers.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 6 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. Melt the butter in a saucepan over low heat.

  2. Add the cheese, cream or milk, mustard, and salt; stir until smooth.

Assemble and serve

  1. Toast the crackers until golden brown.

  2. Pour the cheese mixture over the crackers and 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. 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. Cheese + mustardtop 11% of all pairs
    Smell alikemoderate
    Cooked together1,805 recipes

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

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

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

  5. Mustard + buttertop 22% of all pairs
    Smell alikemoderate
    Cooked together8,003 recipes

    Shared aroma: guaiacol (smoky, sweet).

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 gives the dish its body and flavour.
Cream or milk
Thins the melted cheese so it spreads smoothly and stays creamy rather than grainy.
Butter
Adds fat that helps the cheese melt smoothly and carries flavour.
Mustard
Adds sharp, tangy flavour that balances the richness of the cheese.
Fresh crackers
Provide a crisp, toasted base that holds the sauce without going soggy.

The step that matters

Melting the cheese over low heat. High heat makes cheese proteins tighten and separate, leaving the sauce oily or grainy. Gentle heat and stirring keep it smooth and cohesive.

Swap the mustard

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

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

Fit is the average pairing score against cheese, 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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