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Welsh Rarebit

A cheese sauce made with butter, milk, mustard, salt, and pepper, served over buttered toast.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 ingredients
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Why it works: Butter and milk are a kitchen classic. They rank in the top 7% of all ingredient pairs, and cooks put them together in 81,283 recipes. Both carry (z)-4-heptenal, which smells biscuit, cream. The science ↓

Welsh Rarebit

Ingredients

Directions

Make the cheese sauce

  1. Slice the cheese finely.

  2. In a pan, combine the cheese, melted butter, and milk.

  3. Stir over gentle heat until dissolved.

  4. Add mustard, salt, and pepper.

Serve

  1. Pour the mixture over the buttered toast.

  2. Brown the toast in front of the fire 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. Butter + milktop 7% of all pairs
    Smell alikemoderate
    Cooked together81,283 recipes

    Shared aroma: (z)-4-heptenal (biscuit, cream).

  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. Cheese + milktop 10% of all pairs
    Smell alikemoderate
    Cooked together4,426 recipes

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

  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

Cheese
Melts into a smooth, rich sauce that coats the toast and carries the flavour.
Butter
Adds fat that keeps the melted cheese silky and prevents it from turning grainy.
Milk
Loosens the cheese so it spreads evenly and stays smooth as it heats.
Mustard
Adds a sharp, tangy note that balances the richness of the cheese.

The step that matters

Stir over gentle heat until dissolved. High heat can cause cheese proteins to tighten and separate, leaving the sauce grainy or oily. Gentle, steady heat lets the cheese melt evenly into a smooth sauce.

Swap the mustard

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

  1. Potatofits better
  2. Capsicumfits better
  3. Tomatofits better
  4. Mustardthe original

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