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Welsh Rarebit

A toasted bread topped with butter, cheese, mustard, and pepper.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 5 ingredients
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Why it works: Bread and butter 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

Ingredients

Directions

Prepare the toast

  1. Cut the bread into slices about ½ inch thick and remove the crust.

  2. Toast the bread slightly without hardening or burning, then spread with butter.

Melt the cheese

  1. Cut cheese slices slightly smaller than the bread and place them on the toast in a toaster.

  2. Ensure the cheese melts evenly without burning.

Finish and serve

  1. Spread a little mustard and season with pepper on top, then serve very hot.

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. Bread + buttertop 7% of all pairs
    Smell alikemoderate
    Cooked together27,232 recipes

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

  2. Bread + cheesetop 7% of all pairs
    Smell alikemoderate
    Cooked together2,130 recipes

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

  3. Butter + cheesetop 8% of all pairs
    Smell alikemoderate
    Cooked together7,962 recipes

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

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

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

  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

Bread
Provides a sturdy, crisp base that holds the melted topping.
Butter
Adds richness and flavor to the toast and helps it brown.
Cheese
Melts into a creamy, savory topping that gives the dish its main flavor.
Mustard
Adds sharpness that balances the richness of the melted cheese.

The step that matters

Melting the cheese evenly without burning. High heat causes cheese proteins to tighten and fats to separate, so the cheese turns greasy, rubbery, or scorched. Gentle, even heat keeps it smooth and evenly melted.

Swap the mustard

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

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

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