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Welsh Rarebit

A baked cheese and mustard mixture served on toast.

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

The book gives no oven temperature. The 400°F (200°C) in the steps was added when the recipe was transcribed, as a starting point.

Prepare the topping

  1. Mix the grated cheese, bread crumbs, and butter in a bowl.

  2. Add the mustard and salt, then mix until smooth.

Bake and serve

  1. Spread the mixture evenly on slices of toast.

  2. Place the toast in a 400°F (200°C) oven until hot and slightly brown.

  3. Cover with paper to prevent drying out.

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. Cheese + breadtop 7% of all pairs
    Smell alikemoderate
    Cooked together2,130 recipes

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

  3. Cheese + buttertop 8% of all pairs
    Smell alikemoderate
    Cooked together7,962 recipes

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

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

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

  5. Bread + mustardtop 16% of all pairs
    Smell alikemoderate
    Cooked together1,484 recipes

    Shared aroma: 2-acetyl-1-pyrroline (popcorn, roasted).

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

What each ingredient does

Grated cheese
Melts into a rich, savory layer that gives the rarebit its body.
Bread crumbs
Absorb melted butter and cheese, helping the mixture hold together and stay spreadable.
Butter
Adds fat that keeps the mixture smooth and moist as it heats.
Mustard
Adds sharp, tangy flavour that balances the richness of the cheese.

The step that matters

Covering the toast with paper while it bakes. Without a cover, the exposed surface of the topping dries out and can scorch before the cheese mixture is hot through, so the paper shields it while heat penetrates.

Swap the mustard

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

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

Fit is the average pairing score against cheese, bread, 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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