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Welsh Rarebit

A cheese sauce made with butter, cream, egg, mustard, Worcestershire, and spices, served over toast or wafers.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 9 ingredients
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Why it works: Butter and cream 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 rarebit

  1. Melt the butter in a chafing dish or double boiler.

  2. Combine the beaten egg, mustard, and seasonings in a bowl.

  3. Add the chopped cheese and milk to the melted butter, stirring until blended.

  4. Lower the heat to prevent boiling, then add the egg mixture.

  5. Cook slowly, stirring constantly until smooth and creamy.

Serve

  1. Serve immediately on hot buttered toast or salted wafers.

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 + creamtop 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. Mustard + peppertop 9% of all pairs
    Smell alikemoderate
    Cooked together15,430 recipes

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

  4. Cream + saucetop 9% of all pairs
    Smell alikemoderate
    Cooked together4,787 recipes

    Shared aroma: ethanol (alcoholic, ethereal).

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

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

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

What each ingredient does

American cheese
Melts into the sauce to give it its rich, smooth body and savory flavor.
Butter
Adds fat and richness, helping the cheese melt smoothly into the sauce.
Cream or milk
Provides liquid that loosens the melted cheese into a pourable sauce.
Beaten egg
Thickens the sauce as it heats, giving it a creamy, cohesive texture.
Dry mustard
Adds sharp, pungent flavor that cuts through the richness of the cheese.

The step that matters

Keep the heat low when adding the egg mixture. Egg proteins set and curdle if they get too hot, so the sauce turns grainy instead of smooth. Lowering the heat to prevent boiling and stirring constantly keeps the egg gently thickening.

Swap the white pepper

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

  1. Capersfits better
  2. Tarragonfits better
  3. Nutmegfits better
  4. White pepperthe original

Fit is the average pairing score against cheese, butter, cream, egg, mustard, sauce, 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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