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Welsh Rarebit

A cheese sauce made with butter, cornstarch, mustard, cream, and American cheese, served hot over toasted bread.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 7 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 sauce

  1. In a saucepan, combine butter, cornstarch, and mustard to form a paste.

  2. Heat the cream in a separate pot until hot, then add the paste mixture.

  3. Stir in the cheese and seasonings, mixing until the cheese melts.

Serve

  1. Serve the mixture on toast that has been browned on one side.

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. Butter + cheesetop 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. Mustard + cheesetop 11% of all pairs
    Smell alikemoderate
    Cooked together1,805 recipes

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

  5. Cream + cheesetop 15% of all pairs
    Smell alikemoderate
    Cooked together2,655 recipes

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

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

What each ingredient does

Butter
Enriches the sauce and carries flavour into the paste with the cornstarch and mustard.
Cornstarch
Thickens the cream so the sauce coats the toast instead of running off.
Cream
Forms the liquid base that becomes smooth and rich as it heats.
Soft mild american cheese
Melts into the sauce to give it body, richness and its characteristic savoury flavour.

The step that matters

Adding the paste to the hot cream. Starch thickens only when it is heated in liquid and stirred, so the cream must be hot and the paste whisked in smoothly to avoid lumps and a thin or uneven sauce.

Swap the mustard

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

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

Fit is the average pairing score against butter, pepper, cream, cheese. 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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